Please help!! Combinations

For f(x) = 5x and g(x) = x + 1,
find the following functions.
a. (fog)(x)=
b. (gof)(x)=
c. (fog)(3)=
d. (gof)(3)=
a. (fog)(x)=
(Simplify your answer.)

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse