Find the value of the variable

do not answer if you are unsure!
answer as many as you can !

1. −4x−3=−6x+9

x =
(type your answer as a number)

2.
41−2n=2+n

n =
(type your answer as a number)

3.
5x−7=−10x+8

x =
(type your answer as a number)

4.

7y+3=4y−18

y =
(type your answer as a number)

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Point s lies between points r and t on . if rt is 10 centimeters long, what is st? 2 centimeters 4 centimeters 6 centimeters 8 centimeters