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

How much more interest could $100,000 earn in 10 years, compounded quarterly, if the annual interest rate were 5.5%[..]

A hot air balloon is in the shape of a sphere. Approximately how much fabric was used to construct the balloon if[..]

Trevor's weekly allowance is calculated using a point system. For each chore he does, Trevor gets a point. For each[..]

Solve the equation given that a zero is -1 X^3-5x^2+2x+8=0

In a pet store the number of dogs is 12 more than three times the number of cats. If the pet store has 21 dogs, how[..]

1-sin2x=cosx-sinx

30% Of 50

2 3/4 lbs fabricating 16 rods how many pounds will be created in producing 120 rods

How can you express (15 + 30) as a multiple of a sum of whole numbers with no common factor?