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NO ONE CAN GET THESE PROBLEMS! GENIUSES HELP!?
1. The cost of electricity in a certain city is given by the formula C= .07n +6.50, where C is the cost and n is the number of kilowatt hours used. Solve for n and find the number of kwh used for costs of $49.97, $76.50, and $125
2. The formula E=IR, called Ohm's Law, is used in electronics. Solve for R and then calculate the resistance R if the voltage E is 56 volts and the current I is 7 amperes (Resistance has units of ohms.)
3. Find the domain and range of 3x +2y= -6
4. Find the domain and range of y=x squared +1
5. FInd the domain and range of y= absolute value of 1/2x-3
THANKS 
1.
C = .07n + 6.50
C - 6.50 = .07n
n = (C - 6.50)/.07
n = (49.97 - 6.50)/.07 = 43.47/.07 = 621 kwh
n = (76.50 - 6.50)/.07 = 70/.07 = 1000 kwh
n = (125 - 6.50)/.07 = 118.5/.07 ≈ 1692.857 kwh
2.
E = IR
R = E/I
R = 56 V/7A = 8 ohms
3.
3x + 2y = -6
2y = -3x - 6
y = (-3x - 6)/2 = (-3/2)x - 3
y = -1.5x - 3
Domain: (-∞, +∞)
Range (-∞, +∞)
4.
y = x² + 1
Domain: (-∞, +∞)
Range [1, +∞)
5.
y = |½x - 3|
a)
½x - 3 > 0
½x > 3
x > 6
Domain: (6, +∞)
Range [0, +∞)
b)
½x - 3 ≤ 0
½x ≤ 3
x ≤ 6
Domain: (-∞, 6]
Range (-∞, 0]
Domain: (-∞, 6] U (6, +∞)
Range: (-∞, 0] U [0, +∞)
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