Equation and Expression

Mai poured 2.6 liters of water into a partially filled pitcher. The pitcher then contained 10.4 liters. Write an equation that represents this situation.

• x − 2.6 = 10.4

• x + 2.6 = 10.4

• 2.6 + 10.4 = x

• 2.6 = 10.4 + x

Which expression is equal to 6⁴?

• 10

• 24

• 4⁶

• 6⋅6⋅6⋅6

Select all the equations where x = 3 is a solution.

• x − 3 = 0

• 1 + x = 2

• 6 = 2x

• 9 − x = 3

• x² = 9

Which expression is equivalent to 20c − 8d?

• 2(10c + 4d)

• 4(5c − 8d)

• 4(5c − 2d)

• c(20 − 8d)

Translate the phrase into an algebraic expression: "Seven less than twice a number."

• 20

• 12

• 10

• 18

Translate the following sentence into an equation: "Eight times a number, decreased by 13, is equal to 35."

Here is an expression: 3⋅2^t.

Evaluate the expression when t is 1.

• 6

• 63

• 4

• 5

Here is an expression: 3⋅2^t.

Evaluate the expression when t is 4.

• 72

• 24

• 48

• 10

2/9 of the students in a school are in sixth grade. If the school has x students, write an expression for the number of sixth graders in terms of x.

• 2/9 ÷ x

• 2x

• 2/9 ⋅ x

• 9x