Mary's age is twice the sum of John's age and 3. The sum of both ages is 21 years. Find the age of each one.

Sandy uses 2/7 of a pound of raisins in each batch of raisin bread. Yesterday, Sandy used 5/7 of a pound of raisins. How many batches of raisins bread did she make yesterday.

Why is it that when you take the squre root of a function that is squared you get an absolute value?

Davis knows that the area of his square-shaped bag is 810 cm squared. What is the length of any side of the bag?

Rebecca buys some scarves that cost $5 each and 2 purses that cost $12 each. The cost of Rebecca's total purchase is $39. what equation can be used to find n, the number of scarves that Rebecca buys?

Jake and travel the distance of 175 miles and 5 hours at what rate was he driving

The mean weight of 8 girls is 55kg and the mean weight of a group of boys if 52kg. the mean weight of all the students is 53.2kg. how many boys are there?

Six times the sum of a number and four

Solve: The total cost (C) in dollars for building a house of x square feet is given by the function C (x) = 50,000 + 155x. If the total cost was $283,275.00, how many square feet was the house?

Simplify the algebraic expression. y2 + 11y - 6y + y2

Solve for m. 8m - - 6m + - 7 = 7