Constructing Formulae

The area of a rectangle is found using the formula A = lw. What is the are of a rectangle if l=4 and w=2?

• 6

• 8

• 2

• 16

The formula v = u + at is used to find the final speed. Find v if u=6, a=2 and t=5.

• 16

• 17

• 32

• 60

Three consecutive numbers are to be added together. If x is the smallest number, what are the other two?

• x + 2 and x + 4

• x and y

• x + 1 and x + 2

• y and z

What could be a formula to find the perimeter of the figure above?

• a + a + b

• 2ab

• 2a + b

• a²b

Three consecutive numbers are to be added together. If x is the smallest number, which of the following could be a formula to find the sum of the three numbers?

• 3x+6

• 3x

• 3x+3

• x³

Which of the following is the formula to find the product P of three numbers a, b, and c?

• P = a + b + c

• P = a - b - c

• P = ab + c

• P = abc

One liter of gasoline costs 50 pesos. Which of the following shows the formula for the total cost C for any number of liters (l) bought?

• C = 50l

• C = 50 - l

• C = 50 + l

• C = 50/l

Rachel is one year older than Chandler. Monica is three years younger than Chandler. If Chandler is x years old, which of the following could be Rachel's age?

• x

• x + 1

• x - 3

• 3x

Rachel is one year older than Chandler. Monica is three years younger than Chandler. If Chandler is x years old, which of the following could be Monica's age?

• x

• x + 1

• x - 3

• 3x

Rachel is one year older than Chandler. Monica is three years younger than Chandler. If Chandler is x years old, which of the following could be the sum of all their ages?

• 3x

• 3x + 2

• 3x - 4

• 3x - 2