Please answer questions math help ( please show work)

a) n = 1.8

b) n = 12

Step-by-step explanation:

use cosine for both ⇔ cos =

part a:

⇒ cos 75 =

cos of 75 is 0.2588

⇒ 0.2588 =  

multiply 7 on both sides

⇒ 0.2588 x 7 =   x  

⇒ n = 1.8

part b:

⇒ cos 57 =

cos of 57 is 0.5446

⇒ 0.5446 =

multiply 22 on both sides

⇒ 0.5446 x 22 = x 22

⇒ n = 12

addition

step-by-step explanation:

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25