9x+21x=180 How do you find the measure of each angle

Can you simplify (7+sqrt of 5) (3-sqrt of 5)

4.6 as a fraction in simplest form

A restaurant owner is ordering new chef uniforms. Each uniform has a jacket and pants. The jackets cost $37.99 each, plus a one-time fee of $70.00 to add the restaurant's logo. The pants cost $27.99 each. A.

A warehouse can hold 48 yards high which stacked box height would fit in the warehouse

It takes Marty 1 1/4 hours to get ready for school. If 1/5 of that time is used to shower, what fraction of an hour does it take him to shower?

Solve this Question 134x23/5^3

Which expression is equivalent to 4x-10y

1/3 (22) - 1 - 1/2 (12)

In a fish tank, the ratio of goldfish to guppies is 2 to 4. There are a total of 12 fish in the fish tank. Determine the number of goldfish in the fish tank.

I'm doing easy math but i don't remember learning this so heres the question. One angle of a triangle is 20 degrees. The second angle's measurement is four times the third. Whats is the measure of the third angle?