On a piece of paper, use a protractor to construct a triangle with angle measures of 30° and 50º. what is the measure of the third angle?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?