Solve the system by the addition method.6y = 63 - 7x2x = 78 - 6y
A. {(7, -14)}
B. {(6, -14)}
C. {(-3, 14)}
D. ?
Answer: C
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Solve the formula for the specified variable.P = s1 + s2 + s3 for s3
A. s3 = s1 + P - s2 B. s3 = P - s1 - s2 C. s3 = s1 + s2 - P D. s3 = P + s1 + s2
The function f is one-to-one. Find its inverse.f(x) = 
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 4x
D. f-1(x) = -4x
Solve the problem.The temperature (in degrees Fahrenheit) of a dead body that has been cooling in a room set at 70° is measured as 88°. One hour later, the body temperature is 87.5°. How long (to the nearest hour) before the first measurement was the time of death, assuming that the body temperature of the deceased at the time of death was 98.6°. Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.
What will be an ideal response?
Solve the problem.A car rental company has two rental rates. Rate 1 is $42 per day plus $.12 per mile. Rate 2 is $84 per day plus $.06 per mile. If you plan to rent for one week, how many miles would you need to drive to pay less by taking Rate 2?
A. more than 5000 miles B. more than 9800 miles C. more than 17,150 miles D. more than 4900 miles