Solving for Unknown Numbers

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

Tags

CCSS.HSA.CED.A.3

Choose the equation that matches the situation.

If one roll of masking tape costs $1.15, how many rolls can Emma buy with $5.75?

• 1.15(5.75) = x

• 5.75x = 1.15

• 1.15x = 5.75

• x = 1.15/ 5.75

Tags

CCSS.HSA.CED.A.3

|3m - 9| = 18

• m = 9,-3

• m = 9,3

• m = 9

• no solution

|d + 3| = 6 - 2d

• d = 1, 9

• d = -1

• d = 1

• no solution

2|a - 5| = 22

• a = 16

• a = 16, -6

• a = 16, 6

• no solution

|3h + 2| = 14 - h

• h = 3, -8

• h = 3

• h = 3, 8

• no solution

What is always your last step of solving equations with absolute values?

• Your last step depends on the equation.

• Solve for the unknown answer.

• Check your answer.

• Celebrate that you finished the problem!

Three friend collected money for a fundraisor. Ethan collected $17.50 more than Ann. Joe collected a third of what Ann collected. Together they collected $94.50. How much did Ann collect?

Tags

CCSS.8.EE.C.7B

Find the missing angle.  Find x.

• 20^o

• 70^o

• 160^o

• 180^o

Tags

CCSS.7.G.B.5

Find the value of "x".

• 5

• 90

• 25

• 10

Tags

CCSS.7.G.B.5