Why is triangle angles add up to 180 when everything else is 360?

A high school coach wants to buy new shirts for the 25 members of the track team. The coach must spend less than $300 on the shirts and needs to figure out how much he can spend per shirt, s.

If the mean of m, n, s, P and q is 12. Calauate the mean of (m + 4), (n-3), (s+6) (p-2) and (q+8).

It takes Harland 15 minutes to rake all leaves in the front yard. If Trudy scatters the leaves while Harland rakes, it takes him 20 minutes to rake the leaves. How many minutes does it take Trudy to scatter all the leaves?

Bethany had 25 bracelets, she gave away 10 bracelets, what percent does she have left

A parabola with vertex (h, k) and a vertical axis of symmetry is modeled by the equation y - k = a (x - h) 2. Determine the vertex for a parabola modeled by y = (x - 5) 2 + 8

7.) Sophie can write 80 words in 5 minutes How many words can she write per hour

1. Given the system 2X + 3Y = 18 -2X + 5Y = 14 Explain how you would solve this system using combination. Give the solution as a coordinate pair (X, Y) 2.

At a certain temperature, the speed of sound in the air is 330 meters per second. Which of the following proportions would be used convert this speed into kilometers per second?

Simplify (ac^4 / 3b^3) ^2

A box is 20 cm long. Which of these is closest to the length of this box in feet? (1 inch = 2.54 cm)