Matthew collects purple and red marbles. he has 320 marbles and 65% of them are purple. How many red marbles does he have?

What is the formula for a semicircle

Light travels 1.8x 10 kilometers in one minute. How far does it travel in 9 minutes? Write your answer in scientific notation.

A cylinder has a volume 78cm3 what is the volume of a cone with the same radius and heigh

If Gabby wants to make a regular octagon with a side length of 20 inches using a wire how much wire does she need? Justify your reasoning with an explanation of whether permeter is proportional to the side length.

2. Ebony's bank balance first reached $400 on Day 4. The last day her balance was $400 was Day 8. (a) Determine. Explain how you determined these amounts. (b) Estimate. Explain how you determined these amounts.

show answer using graph y=2x - 3 y=3x + 2

How can u use the Distributive Property to answer 144-:-8=?

I do not know what multiplication problem for (8*3,000) + (8*200) + (8*9) is

The sum of positive integers x and y is 246, and x/y = 5. What is the value of y?

Where do martians leave thier spaceships