Solving for Unknown Numbers

∣ 2x + 9 ∣ = 15

• x = 3

• x = 3, -6

• x = 3, -12

• x = 6, -12

Solve |x – 12| - 3 = 11.

• x = -2, -26

• x = -2, 26

• x = 3, 25

• x = 4, -7

|−2n| + 10 = −50

• r = 30, -30

• r = 20,-20

• r = -5,5

• No Solution

Solve for r.

−2|−2r − 4| = -12

• r = 5,1

• r = -5,-1

• r = -5,1

• No Solution

Find the solution:
10 = 4x - 2

• x = 3

• x = 2

• x = -3

• x = -2

3(x - 2) = 18

• 6.7

• 4

• 8

• -4

• none of the above

4x + 7 = 23

• x = 16

• x = 4

• x = 9

• x = 12

The difference between 5 times a number and 3 is 12.

• 3h - 5 = 12

• 5h - 12 = 3

• 5h - 3 = 12

• 12h - 3 = 3

For a school assembly, 304 students are to be seated in rows with 16 students in each row. How many rows of students will be seated for the assembly? Let r be the number of rows.

• r = 304 ÷ 16

• r = 16 ⋅ 304

• 304r = 16

• r = 16 ÷ 304

• 16r = 304

3(x - 2) = 18

• 6.7

• 4

• 8

• -4

• none of the above