A teacher had 21 red pens. if the ratio of red pens to blue pens owned was 3:1 how many pens did she have in total

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?

explain why it makes sense for the original amount to be the denominator when you write a proportion to find the percent change

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