Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set.-0.9(x + 9) + 0.1(x + 9) = -0.8x - 7.2
A. Contradiction; ?
B. Conditional; {-9}
C. Conditional; {-0.8}
D. Identity; {all real numbers}
Answer: D
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Use a calculator to perform the operation. Express your answer in scientific notation.
A. 2.87 × 1027 B. 2.865657742 × 1027 C. 6.62 × 101 D. 2.87 × 1025
Let 
. If x is decreased by 1.05%, how is y affected? Round your answer to two decimal places if necessary.
?
A. y is decreased by 1.78% B. y is increased by 9.22 % C. y is increased by 1.78% D. ?y is decreased by 9.22%
Suppose the total cost in maunufacturing x units of a certain product is C (x) dollars.
a. What does C'(x) measure? Give units. b. What can you say about the sign of C'? c. Given that C'(3000)=11, estimate the additional cost in producing the 3001st unit of the product.
Solve.The area of a square is found by the equation A = s2 where s is the length of a side. If the area of a square porch is 64 square feet, find the dimensions of the porch.
A. 10 ft by 10 ft B. 7 ft by 7 ft C. 9 ft by 9 ft D. 8 ft by 8 ft