The measures of two angles of a triangle are 25° and 87°. Is the triangle acute, right, or obtuse? A. Acute; the measure of the third angle is 68°. So all three angles are acute.
B. Acute; the measure of the third angle is 78°. So all three angles are acute.
C. Obtuse; 25° + 87° = 112° and 112° is an obtuse angle.
D. Right; 25° + 87° = 112° and 202° – 112° = 90°.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Given: △acm, m∠c=90°, cp ⊥ am , ac: cm=3: 4, mp-ap=1. find am.

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.