Can someone work out 1&2 for me? I’m totally lost on what’s going on.

What is the value of x when x + 7 = 21?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Which of the following describes the graph of y--4x-36 compared to the parent square root function? stretched by a factor of 2, reflected over the x-axis, and translated 9 units right stretched by a factor of 2, reflected over the x-axis, and translated 9 units left stretched by a factor of 2, reflected over the y-axis, and translated 9 units right stretched by a factor of 2, reflected over the y-axis, and translated 9 units left save and exit next submit