Please answer the question

cos7x+sin4x=1

cos7x=1−sin4x

cos7x=1−(sinx)2

cos7x=(1−sin2x)(1+sin2x)

cos7x−cos2x(1+sinn2x)=0

cos2x[cos5x−1−sin2x]=0

cosx=0

x=−π2,π2,0.

Step-by-step explanation:

$13.2

$113.20

Step-by-step explanation:

Simple interest for the fourth year = 13.20 ( 3.30 - 4)

New amount in the bank acount for 4th year = 100+ (3.30 x4) = 113.20

Hope this helps

29.5977692753

step-by-step explanation:

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168