Answer:
15309 Im pretty sure
Step-by-step explanation:
a7=ar^7
=7(3^7)
7 x 2187=15309
Answer:
x = 121
Step-by-step explanation:
all angles sum = 540
87 + 92 + 105 + 135 = 419
540 - 419 = 121
Answer:
7y(2y+1)
Step-by-step explanation:
Hello!
To find cosine, use the formula cos = adjacent / hypotenuse.
According to angle B, adjacent of angle B is side A, and the hypotenuse is side c because the hypotenuse is always opposite the right angle.
Therefore, the cosine of angle B is a/c.
