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GCSE Maths calculator paper question?

Hi, Im not sure how to answer these questions so if anyone can explain what should do, that would be great. The perimeter of a rectangle is 25cm. The length of a rectangle is Xcm (Image of a rectangle with one side longer marked Xcm) (a) Write an expression for the width of the rectangle Id say 2h = 25 – 2x for h = 12.5 – x * Not certified if thats correct. Also, because he says "In terms of X" means it must be: x = 12.5 – H * (b) The area of a rectangle is 38 cm ^ 2. Show that 2x ^ 2 – 25X + 76 = 0 * Not very sure what I should do here. May replace X with my equation above? * (C) Solve the equation in part (b) to find the value of X Giving answer to 2 decimal places. * If all you have to do is solve this quadratic equation, like any other, and give 2 answers for x, then there is no need to do this *

a) 25 = 2x + 2h 2h = 25 – 2x h = 12.5 – Assuming xh is the width and height x (sounds strange, but whatever). b) 38 = h * x 38 = (12.5 – x) * X 38 = 12.5 x – x ^ 2 x ^ 2 – 12.5 x + 38 = 0 2x ^ 2 – 25x + 76 = 0 So I created a second equation for the area: 38 = h * xy replaced with the response a). Basically it is a simultaneous equation. C) Yes, that's what we do. Use the quadratic formula, of course.

Algebra I: Expressions, Equations, and Applications $26.93 Algebra I: Expressions, Equations, and Applications

Algebra 1: Expressions, Equations, And Application $3.75 Algebra 1: Expressions, Equations, And Application

Algebra 1: Expressions, Equations, and Applications $2.9 Algebra 1: Expressions, Equations, and Applications

Algebra I: Expressions, Equations, And Applications $3.98 Algebra I: Expressions, Equations, And Applications

Writing the Book of Esther (French Expressions) $1.26 Writing the Book of Esther (French Expressions)

Algebra 1 Chapter 11 Grab & Go File Radical Expressions And Equations $3 Algebra 1 Chapter 11 Grab & Go File Radical Expressions And Equations

Algebra 1 Chapter 12 Grab & Go File Rational Expressions And Equations $6.94 Algebra 1 Chapter 12 Grab & Go File Rational Expressions And Equations

Personal Expressions: Writing Your Way Into English $7.82 Personal Expressions: Writing Your Way Into English

Using a Calculator $13.97 Ann's grandfather is teaching her how to use a calculator. This simple, engaging book describes the parts of the calculator, what the math symbols on the buttons mean, and how to do simple equations. Concepts explained include addition, subtraction, division, mulitplication and patterns.

Using a Calculator $3.48 Ann's grandfather is teaching her how to use a calculator. This simple, engaging book describes the parts of the calculator, what the math symbols on the buttons mean, and how to do simple equations. Concepts explained include addition, subtraction, division, mulitplication and patterns.

Sharp Electronics Scientific Calculator EL520WBBK $31.53 model- el-520wbbk vendor- sharp electronics features- advanced scientific calculator- black the el-520wbbk performs over 419 advanced scientific functions and utilizes a 2-line display and multi-line playback to make scientific equations easier for students to solve. it is ideal for students studying general math algebra geometry trigonometry and calculus. in addition it can be used for statistics biology chemistry and physics.* direct algebraic logic allows students to enter the elements of an expression in the exact order they appear in the textbook. * extra large display 12 digit 2 line display - 1 line equation and 1 line numeric.* multi-line "playback" after getting an answer the user may then "playback" the expressions and substitute new numeric values. * additional features includes differential and integral calculus functions 419 functions and hard case. -- specifications ----------------------------------general - display type : alpha-numeric number of lines in display : 2 logic : d.a.l. number of functions : 419 power supply : solar & battery (lr44 x 2) hard case : yes continuous calculation : yes automatic power down : yes mathematics - f.s.e display format : yes parenthesis levels : 24 log in (and inverse) : yes x other symbols : yes percent pi & other symbols : yes fraction calc : yes solves 3 simultaneous equations : yes complex numbers : yes editing - equation playback : yes last answer recall : yes last digit correction : yes trigonometry - sin cos tan et inverse : yes hyperbolic func et inverse : yes deg/rad/grad mode : yes drg conversion : yes science - dmsdd : yes pr : yes metric conversions : 44 physical constants : 52 computer math- dec. hex. oct. and binary : yes logic operators : yes statistics - one variable : yes two variable : yes x mean std. deviation : yes y mean std deviation : yes regression types : 6 permutation and combination : yes factorial : yes random numbers : yes memory - number of memories : 9 sto rcl and ans keys : yes memory calculations : m+ m- manufacturer warranty:.

Sharp Electronics Scientific Calculator EL506WBBK $30.03 model- el-506wbbk vendor- sharp electronics features- scientific calculator the el-506wbbk performs over 469 advanced scientific functions and utilizes a 2-line display and multi-line playback to make scientific equations easier for students to solve. it is ideal for students studying general math algebra geometry trigonometry and calculus. in addition it can be used for statistics biology chemistry and physics.* direct algebraic logic allows students to enter the elements of an expression in the exact order they appear in the textbook. * extra large display 12 digit 2 line display - 1 line equation and 1 line numeric.* multi-line "playback" after getting an answer the user may then "playback" the expressions and substitute new numeric values. * additional features include differential and integral calculus functions 469 functions and hard case. -- specifications ----------------------------------display - 2-line alpha-numericlogic - d.a.l.# of functions - 469continuous calculation- yesauto power down - yespower supply - solar & battery (lr44 x 2)mathematics - f.s.e display format parenthesis levels: 24 log in (and inverses) x other symbols percent pi and other symbols fraction calculation solves 3 simultaneous equations complex numbers editing - equation playback last answer recall last digit correction trigonometry - sin cos tan and inverse hyperbolic function and inverse deg/rad/grad mode drg conversion science - dmsdd pr metric conversions: 44 physical constants: 52 computer math - calculation and conversion dec. hex. oct. and binary logic operators statistics - one variable two variable x mean standard deviation y mean standard deviation regression types: 6 permutation and combination factorial random numbers memory - number of memories: 9 sto rcl and ans keys memory calculations m+ m- programming - formula manufacturer warranty:.

Texas Instruments Ti-89 Titanium Graphing Calculator $276.76 bIncludes USB unit-to-unit cable, Connectivity Cable for other TI units and connection software, operating manual/b Doing complex calculations on a scientific calculator is much easier with the TI 89. Its large screen offers the ability to generate graphs that can illustrate your conclusions. It's especially helpful with statistic functions, such as regression analysis. The TI-89 Titanium includes all the built in functionality and power of the original TI-89. It has an increased amount of Flash ROM 500KB, quite powerful for a traditional handheld design. This is TI's most sophisticated calculator, with such features as 3D graphing, upgradable flash ROM, built-in assembly language programming, and a generous amount of user-available memory. It now includes a mini USB port. This portable symbolic, numeric, and graphing calculator is perfect for advanced mathematics and engineering applications for college and advanced coursework. Its built-in USB port makes data transfer ultra-convenient. Built-in Flash memory for archiving data(2.7MB) Finance tools, Organizer, Polynomial Root Finder, Simultaneous Equation Solver, and many more apps Fully upgradeable (electronically) through its Flash ROM chip (optional TI Graph-Link required) Computer Algebra System, differential equations, 2D-graphing and data analysis, 3D-graphing with rotations, linear algebra, interactive numeric solver, constants, unit conversions, statistical regressions Optional Assembler language Mathematical expressions appear on the display the same way as they are usually written in class or in published texts and academic journals StudyCards and Symbolic Math Guide for helping students learn more effectively Preloaded with Official AP Calculus exam review questions Built-in USB port for easy data transfer between handhelds - The TI Connect allows rapid data transfer to computersulliGraphing calculator handles calculus, algebra, matrices, and statistical functionsli188 KB@qL(õÂ?\ÿ¾Úx

Casio CLASSPAD330 Pen-based Graphing Calculator $220.72 model- classpad300 vendor- casio calculators features- classpad300 pen-based graphing calculator the classpad 300 comes packed with an impressive collection of applications that support self-study like 3d graphing geometry eactivity and lots more. a big 160x240 pixel lcd touch screen enables easy and intuitive stylus-based operation. uses an intuitive pull-down menu interface that simplifies even complex operations. solutions expressions and other items can be selected with the tap of the stylus. supports drag and drop copy and paste and other pen-based operations that help minimize key operations. versatile graphing tools for 3d graphing and drawing of geometric figures which provides plenty of support for the math studies of students. presentation application provides the teachers with tools for creating materials to promote student understanding of mathematical concepts and problem solving processes. eactivity application allows the creation of eactivities that can include figures expressions and explanations.* pen touch operation-computer-like intuitive operations for menu selection button operations etc. drag & drop supports dragging of an input expression to a graph screen for instant graphing.* cas (computer algebra systems) - natural display input enables input of fractions differentials integrals sum calculations lim calculations and other expressions in the same format as that used in mathematics texts. - function conversion function - algebra assistant * eactivity application - creation - buttons for expression processing text statements and eactivity function recall. - each teacher can create activities on his or her own calculator. - button for recalling user-created programs - application & classroom - go-along-anywhere digital text book and digital handout functions. - allows tailoring of classroom materials to local needs. - contents installable using data communication.* presentation application-register application screen screen shots for playback in slide show format that is great for presenting eactivity results and other lessons. includes auto play manual play and page editing functions.* geometric graphing-constraint geometry (geometric functions for education) geometric figure graphing (triangle polygon circle etc.) geometric figure analysis (angle length) animation.* 3-dimensional graphing trace zoom rotate -- specifications ---------------------------------memory - available ram/flash rom : 500k/4m prior entry recall : history number and constant memory: user-definable calculatory software applications electronic upgradability display - interface : iconic menu lines be characters : proportional screen size (pixels) : 160x120 split screen with graph and table graphing - function : 20 x 5 parametric polar inequality (auto shading) zoom trace dynamic "modify" functionality conic sections - graph conic sections - characteristics calculation conic sections - characteristics drawing differential equations/slope fields

Orchestra Expressions (expressions Music Curriculum) $85.26 IOrchestra Expressions/I provides music educators at all levels with easy-to-use, exciting tools to meet daily classroom challenges and bring new vibrancy and depth to teaching music. The lessons were written based on the National Standards for the Arts in Music -- not retro-fitted to the Standards. The program is music literacy-based and satisfies reading and writing mandates in orchestra class. brUnique Features of IOrchestra Expressions: /Ibrbr* Four-fingers-down start for every instrument brbr* Separate but simultaneous development of both hands brbr* Bass begins in III position developing early shifting brbr* Orchestra arrangements by Sandra Dackow brbr* Final full orchestra concert piece