Math 7 Lab Week 11- Chapter 4

Easy Equations

100

1.50 + a = 3.75

a = 3.75 - 1.50 = 2.25

200

1.20 = s + .8

s = 1.20 - .8 = .4

300

y - 4.5 = 10

y = 10 + 4.5 = 14.5

400

a - (-9.7) = 18.9

a + 9.7 = 18.9

a = 18.9 - 9.7 = 9.2

500

z + (- 24.8) = 56.8

z  - 24.8 = 56.8

z = 56.8 + 24.8 = 81.6

Medium Equations

100

14.2 m = -42.6

-42.6/14.2 = -3

200

-4.5c = 1.125

1.125/-4.5 = -.25

300

y/6.12 = 0.8

y = (6.12)(0.8)

y = 4.896

400

80 = d/0.1

d = 80(0.1)

d = 8

500

8.48 = w/-0.06

w = (-0.06)(8.48) = -0.5088

Hard Equations

100

32.5 = 4.3x + 16 - x

32.5 = 3.3x + 16

32.5 - 16 = 3.3x

16.5 = 3.3x

16.5/3.3 = 5 = x

200

27h + 4.1 = 12.2

27h = 12.2 - 4.1

27h = 8.1

h = 8.1/27 = .3

300

w/9.2 + 7 = 6.5

w/9.2 = 6.5 - 7

w/9.2 = -.5

w = (9.2)(-5) = -4.6

400

x/-3.5 + 4.1 = 7.2

x/-3.5 = 7.2 - 4.1

x/-3.5 = 3.1

x = (-3.5)(3.1) = -10.85

500

8.12 = -1.5x - 8.12 - x

8.12 + 8.12 = -1.5x + (-x)

16.24 = -2.5x

x = 16.24/-2.5 = -6.496