Solve the formula for the given variable.I = 
for n
A. n = 
B. n = 
C. n = IR(Ir - E)
D. n = 
Answer: D
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Solve the initial value problem.y'(t) = 4y - 20, y(0) = 9
A. y = 9e4x + e5
B. y = 4ex/4 + 20
C. y = 
e4x + 
D. y = 4e4x + 5
Solve the problem.It costs $37 per hour plus a flat fee of $29 for a plumber to make a house call. Find the total cost to have a plumber come to a house for 10 hours.
A. $327 B. $1083 C. $370 D. $399
Solve the problem.Paul has grades of 91 and 93 on his first two tests. What minimum score must he get on his third test in order to have an average of 80?
A. 80 B. 92 C. 88 D. 56
Solve the problem.Stevie bought a stereo for $290 and put it on sale at his store at a 65% markup rate. What was the retail price of the stereo? Round to the nearest cent if necessary.
A. $378.50 B. $478.50 C. $580.00 D. $390.00