Multiply.(x - 2y)(-5x - 4y)
A. x2 + 6xy + 8y2
B. -5x2 + 6xy + 6y2
C. -5x2 + 6xy + 8y2
D. x2 + 6xy + 6y2
Answer: C
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A building casts a shadow of 12 feet. At the same time a 3 foot yard stick held vertically casts a shadow of 4.5 inches. How tall is the building?
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Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.A chemist needs 210 milliliters of a 49% solution but has only 16% and 79% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 103 ml of 16%; 107 ml of 79% B. 110 ml of 16%; 100 ml of 79% C. 100 ml of 16%; 110 ml of 79% D. 103 ml of 16%; 110 ml of 79%
Multiply and simplify.
? 
A. 
B. 
C. - 
D. - 