Solve the system by the substitution method.xy = 56x + y = -15
A. {(7, -8), (8, -7)}
B. {(-7, 8), (-8, 7)}
C. {(7, 8), (8, 7)}
D. {(-7, -8), (-8, -7)}
Answer: D
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Find a 95% confidence interval for the true population proportion.In a random sample of 186 births at one hospital, 33% were by Caesarean section.
A. 25.7% to 40.3% B. 32.9% to 33.1% C. 29.3% to 36.7% D. 32.5% to 33.5%
At what points is the given function continuous?f(x, y, z) = 
A. All (x, y, z) such that x2 + y2 ? 81 B. All (x, y, z) such that x2 + y2 ? 0 C. All (x, y, z) D. All (x, y, z) such that x2 + y2 ? 9
Use mathematical induction to prove the following.0.04n < 0.04n-1
What will be an ideal response?
Mr. Jackson borrowed money from his bank and on his life insurance to start a business. His interest rate on the bank loan was 10%, and his rate on the insurance loan was 12%. If the total amount borrowed was $100,000 and his total yearly interest payment was $11,400, how much did he borrow from the bank? ?
A. He borrowed $70,000 from the bank. B. He borrowed $7,200 from the bank. C. He borrowed $41,400 from the bank. D. He borrowed $58600 from the bank. E. He borrowed $30,000 from the bank.