math study guide grade 8

Solve for x:

-6 = x/8 + 4

• -80

• 16

• -16

• 1.8

Solve for x:

37 - 18 + 8w = 67

• -6

• 4

• 7

• 6

If there was an irregular triangle with angle a = 68 and angle b = 26, what would angle c be equal to?

(Hint: the sum of all angles in a triangle always add up to 180)

• 6

• 180

• 90

• 86

Which equation is equality?

• 11-(2v+3)=-2v-8

• 5w+8-w=6w-2(w-4)

• 7m-2=8w+4-m

• 8y+9=8y-3

The cross products of a proportion are ___ equal.

• always

• sometimes

• never

solve for x.

(hint: x/17=18/25)

• 12.2

• 19.1

• 26.5

• 26

In similar triangles, corresponding angles are ___ congurent.

• always

• sometimes

• never

What is the rate of change when something goes from 100 to 103?

• 2.6% increase

• 3.4% decrease

• 3% increase

• 3% decrease

• rational

• irrational

• rational

• irrational