How old was Lisa x years ago if she is now 13?

Which expression represents this?

x + 13

x - 13

13 - x

What is the value of x in the diagram? A. 1/2 B. 4/21 C. 2 D. 4 (its a triangle where one side is divided into 9 and 4x-2 and the other side is divided into 12 and 3x+2) I believe that the fractions should be 9/4x+2 and 12/3x+2 for the cross

The number of hours, x, Ryan rides his bike and the total number of miles, y, he rides is a linear relationship. Ryan has already ridden 5 miles, and he can ride at a constant rate of 12 miles per hour. Write an equation relation x hours and y miles.

Tariq has a collection of 32 quarters that he wants to send to his cousin. What is the total weight of the quarters in kilograms

What percent is 7.2 of 19.5

59742 The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system, 1 0 5 0 1 - 3. 0 0 0 a c.

What is the relationship between the value of a dollar and the value of a dime

The Cool Company determines that the supply function for its basic air conditioning unit is S (p) = 40 + 0.008p^3 and that its demand function is D (p) = 200 - 0.16p^2, where p is the price. Determine the price for which the supply equals the demand.

Seven three squared plus ten

Which exponential equation is equivalent to the logarithmic equation below? c = ln 2

What is £390 shared as 5:8 ratio