7th Grade Algebra: Expressions & Variables Quest

A store sells pencils for $x each. If you buy 5 pencils, how much do you spend? Write an expression for the total cost.

• 5x

• 5+x

• 10x

• x+5

Maria has $50. She spends $x on a book. Write an expression to represent how much money she has left.

• 50 - x

• 50 - 50

• 50 + x

• x - 50

The perimeter of a rectangle is 2(l + w). If the length is 3 more than the width (w), express the perimeter in terms of w.

• 4w + 6

• 4w + 3

• 2w + 6

• 6w + 3

A car travels at a speed of x miles per hour. How far will it travel in 3 hours? Write an expression for the distance.

• 9x

• x/3

• 3x

• 6x

If a number y is doubled and then decreased by 4, what expression represents this operation?

• 2y - 4

• y - 4

• 2y + 4

• y / 2 - 4

A recipe calls for x cups of flour. If you want to make 3 batches, how many cups of flour do you need? Write an expression for the total flour needed.

• 2x

• 4x

• x/3

• 3x

The total cost C of a meal is given by C = m + t, where m is the meal cost and t is the tip. If the meal costs $x, write an expression for the total cost.

• C = x + t

• C = m * t

• C = m + x

• C = x - t

A school has x students. If 10 more students enroll, how can you express the new total number of students?

• x + 10

• x + 5

• x - 10

• x * 10

If the area A of a triangle is given by A = 1/2 * b * h, where b is the base and h is the height, express the area in terms of b and h.

• A = 1/3 * b * h

• A = b + h

• A = 1/2 * b * h

• A = b * h

A gardener plants x flowers in each row. If there are 4 rows, how many flowers are planted in total? Write an expression for the total number of flowers.

• 4x

• x+4

• 2x

• 8x