Which expression is equivalent to (x y) z?

(x + y) + z

2 z (x y)

x (y z)

x (y + z)

At the beginning of the year, Zachary had $40 in savings and saved an additional $20 each week thereafter. Isaac started the year with $85 and saved $11 every week.

Is p+p and p+7 equivalent

45,609,549 rounded to the ten millions place

An item priced at $10.20 has a sales tax of $0.41. Find the sales tax rate expressed as a percent.

Two teams of interns are wrapping donated gifts at a hospital. if the teams work alone, team a can wrap all of the gifts in 7 hours, and team b can wrap all of the gifts in 5 hours.

Choose the correct sum of the polynomials (4x3 - 2x - 9) + (2x3 + 5x + 3).

5x-5 + (6y-4) + 4x+10=180

Does the fraction 1/2 make the equation 1/34 + 8/17 = 1/2 true?

Remember that you can multiply by the reciprocal of the divisor when you divide by a fraction. find each quotient. simplify if possible 1. 1/3:2 2. 1/7:7 3. 1/2:8 4. 1/8:2

Draw a area model to solve the following. Find the value of the following expression. 30 * 60