When we add/subtract fractions, why do we need denominators?

What is the volume, in cubic units, of a pyramid of height 8 and a square base of length 15? Select one: A 1800 B 600 C 900 D 225

Write the polynomial in standard form. 4g-g^3+3g^2-2 A) - 2+4g+3g^2-g^3 B) g^3-3g^2+4g-2 C) 3g^3-g^2+4g-2 D) - g^3+3g^2+4g-2

12a + 5 minus 8a = negative 1

At a music store, the price of speakers is 245, plus the sales tax of 6.5%. what is the total cost of the speakers including the sales tax?

What numbers multiply to give you 600 and adds to give you 125?

I have done a math equation for school and i forgot if i could leave a inproper fraction as my answer or if its a fraction i can reduce should i or should i not

Enter the value of n so that the expression (-y + 5) + (7y - 9) is equivalent to (ny - 4)

The heavyweight weight class in high school wrestling is from no less than 195lb and a maximum 285 LB write two inequalities to represent this range

A shose box measures 15in. by 7in. by 4 an half

Write the equation or inequality : in order to take honors level math, Lisa must have an average of 85 on her math tests. Her scores so far are 85, 70, and 98. What is the minimum score Lisa needs on the fourth test to get into honors math class?