! use substitution to solve the system of equations. a. (4, –6) b. (9, –1) c. (17, 1) d. infinitely many solutions

The measurement of one angle of a right triangle is 34°. what is the measurement of the third angle?

Plz.yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a