The sum of a number and 3 times a second number is represented by a+3b = 39. The sum of half the of the first number and 1/3 of the second number is represented by 1/2a+1/3b=9. What is the first number a? What is the second number b?

Evaluate 5z^2 when z = 3 and when z = - 3

Jonathan is eating veggie wraps with his friends. In the box, there are four spinach wraps, four lettuce wraps, and three tomato-basil wraps.

Which represents a perfect cube? A. 8x8x8 B. 8+8+8 C. 9x9x9x9 D. 9+9+9+9+9

When creating vases for the craft fair, Thomas used the proportion 3 pounds of clay is to 8 vases as 9 pounds of clay is to 24 vases.

Currently, you have $80 answer your sister has $145. You decide to save $6 of your allowance each week, while your sister decides to spend her whole allowance plus $7 each week. How long will it be before you have as much money as your sister?

Can 4x+9x+5 be simplified

Round off 0.043 to one significant figure

There are fifty people in line for tickets to the Royal Rumble. Each time a fan buys a ticket, you skip two places in line. How many fans will buy tickets before you do?

What is 1/3 plus 1/3

How to know if something is a right triangle with slope formula?