7th-grade math review

Circles/Triangles/Quadrilaterals

100

What is the formula for the area of a circle 

A=(pi)r²

200

define:

Vertical angles

Supplementary angles

Complimentary angles 

Vertical= two angles that are across from each other that equal each other

Supplementary= two angles that add up to 180^o

Complimentary= two angles that add up to 90^o

300

Angles A and B are supplementary. Angle A is 72^o what is the measure of angle B? 

108^o

400

A quadrilateral has two sets of vertical angles: A/B and C/D. Angles A/C and B/D are supplementary angles. If angle A=128^o what do the other angles equal

A=128^o

C= 52^o

B=128^o

D=52^o

500

Angles A/B/C are on a supplementary line.

Angles A/B form a complementary angle 

Angle A is 32^o

What is the measure of the rest of the angles  

A=32^o

B=58^o

C=90^o

2-Step(?) Equations

100

-4x+7=15

x=-2

200

x/3 +8=14

x=18

300

3x+5+x=21

x=4

400

(x+7)/5 + 2=26

x=121

500

x²-13=12

x=5

Percent Increase

100

A store is having a sale of 40% off. If an item is $63 how much is it after the discount?

$37.80

200

78=x% of 86

x=91%

300

Sales tax is 4%. If a person's total before tax is $27, how much is it with tax?

$28.89

400

the cost of a pair of pants was increased by $2.75. If it was an 11% increase, what was the original cost?

$25

500

From 2006 to 2007 smartphone users increased from 7.7 million to 31 million. What was the percent increase?

303%

Proportions

100

What does the k stand for in the formula 

y=kx

K= constant of proprotionality

200

y=35 when x=7

y=? when x=12

y=60

300

Solve for k (y=kx)

(2,4) (4,8) (16,32)

k=2

400

15/20=x/4=x₂/16

Solve for x and x₂

x=3 x₂=12

500

22/223=31/x

x=314.23

Inequalities

100

What happens to an inequality when we divide or multiply by a negative?

The sign flips 

200

solve 

3x-9>27

x>12

300

Graph the inequality 

x+6<18

x<12

400

2(4x+10)<26

x<3/4

500

-3(5x-7)>51

x<2