Week 01 - Math and Graph Self-Test Solutions

# Week 01 - Math and Graph Self-Test Solutions - SOLUTIONS TO...

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SOLUTIONS TO MATH AND GRAPH SELF-TEST 1. What is the value of ‘a’ in the equation, a = [b/(c + d)] x 100, if b = 6, c = 6, and d = 114? a = 5 2. What is the value of ‘a’ in the equation, a = 10 b 1/2 , if b = 36? a = 60 3. What is the reciprocal of .92? Reciprocal = 1/x = 1/.92 = 1.087 4. What is the decimal equivalent of .3%? .3% = .3/100 = .003 5. What is the percentage equivalent of .1? .1 = (.1 x 100)% = 10% 6. What is the value of ‘a’ in the ratio 1:a so that the ratio equals the ratio, 4:6? a = 6/4 or 1.5 7. What is the value of ‘a’ in the ratio 1:a so that the ratio equals the ratio, 8:5? a = 5/8 or .625 8. If a value increases from 20 to 28, what is the rate of change expressed as a percentage? % change = (new value – old value) x 100/old value = (28 – 20) x 100/20 = 40% 9. If a value is initially equal to 500 and increases by 4%, what is the new value? New value = 500 + (.04 x 500) = 520 10. What are the values of ‘x’ and ‘y’ in the following system of equations, y = 3x - 2 and 2y = -2x + 12? One way to solve is to multiply the first equation by 2 to yield 2y = 6x - 4.

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## This note was uploaded on 10/13/2009 for the course ECON 1221 taught by Professor Whitaker during the Winter '09 term at Langara.

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Week 01 - Math and Graph Self-Test Solutions - SOLUTIONS TO...

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