Find the derivative of f(x) = 7 divided by x at x = 1.

Step-by-step explanation:

f(x)=\frac{7}{x}=7x^{-1}

f'(x)=7(-1)x^{-2}=-\frac{7}{x^2}

f'(1)=-7/1=-7

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

use formula for the circle a=3.14

step-by-step explanation: