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.

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0