Use a double-angle identity to find the exact value of the expression.2 cos2 
- 1
A. - 
B. - 
C. 
D. 
Answer: A
Mathematics
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Solve and check the equation.4(5x + 3) + 3(2x - 2) = 5x + 90
A. {8} B. {9} C. {4} D. {-2}
Mathematics
The function f is one-to-one. Find its inverse.f(x) = 
A. f-1(x) = (x - 2)2
B. f-1(x) = 
C. f-1(x) = x2 - 2, x ? 0
D. f-1(x) = x2 + 2, x ? 0
Mathematics
Find the amount paid by each insurance company. Assume that any coinsurance requirement is met.Insurance loss: $10,000Company A coverage: $84,000Company B coverage: $28,000
A. A pays: $7,500 B pays: $2,500 B. A pays: $8,400 B pays: $1,600 C. A pays: $10,000 B pays: $0 D. A pays: $7,200 B pays: $2,800
Mathematics
Find the prime factorization of the product.45 ? 15 ? 49
A. 3 ? 9 ? 5 ? 5 ? 7 ? 7 B. 3 ? 3 ? 5 ? 5 ? 7 ? 7 C. 3 ? 3 ? 3 ? 3 ? 5 ? 7 ? 7 D. 3 ? 3 ? 3 ? 5 ? 5 ? 7 ? 7
Mathematics