Claire is making new oushion covers for a chair. There are three sizes of cushions on the choir What is the surface area of the arm rest cushion?
21
Not for Arm Rost
10 in
10 in
10
10 w
15 in
10 in
10 in
18 in
10 in
2116
A 320 square inches
8. 200 square inches
C. 990 square inches
D. 846 square inches

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)

Find the rate of change for the situation. you run 7 miles in one hour and 21 miles in three hours.