Language of Algebra and expressions

Translate the following word problem into an algebraic expression: "The sum of a number and 7."

• 3

• y

• 5

• 8

• 4

• x

• -2

• 2

• 7

• a

• 3

• 10

Translate the following word problem into an algebraic expression: 'Twice a number decreased by 4, then multiplied by 3.'

• -6

• m

• 8

• -8

• 9

• k

• 12

• 21

Translate the following word problem into an algebraic expression: "Three times a number plus 5."

• $25

cost of making a phone call is calculated as 20 cents per minutes plus a flat rate of 5 cents per phone call. Write an expression to show the cost of a phone call in cents for t minutes.