3). (2 points each) Combine the X's and solve these equations: (I will combine the terms in the first problem for you!)

a).


b). X + X = 18

__________

X = _______

 c). X + 2X = 9

__________

X = _______

d). X + X + X = 18

__________

X = _______

 e). 3X - 2X = 15

__________

X = _______

 f). 5X + 2X + 2X = 81

__________

X = _______

g). X + 5 - 3 = 10

__________

X = _______

 h). 2X2 - X2 = 81

__________

X = _______

 i). 3X + X + 2X + 5 = 41

__________

X = _______
4). (2 points each) Find X for each of these perimeter problems. First write down the equation for the perimeter, then solve it. I will write the first equation for you.


a). The perimeter is 36 inches.
Equation:

2X+X+2X+X=36

X = _______

 b). The perimeter is 64 feet.
Equation:

________________

X = _______

c). The perimeter is 100 inches
Equation:

________________

X = _______

 d). The perimeter is 144 feet
Equation:

________________

X = _______