Use a calculator to find the approximate value of cos-1(0.78).

38.74

Step-by-step explanation:

Hello, I think  I can help you with this.

in a standard calculator you will find the inverse cosine function as the second function of the cosine key

so

step 1

once the calculator is on, press the shift key and then the cosine key, then write the number and close the parenthesis, finally press the equal key

shift ⇒cos⇒0.78⇒)⇒=

in the display you will see( DEG mode)

Now, approximate

      38.7394246\≈38.74

Have a great day.

goog may have it for you

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation: