Solve.How much pure acid should be mixed with 9 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 4.5 gal
B. 13.5 gal
C. 36 gal
D. 22.5 gal
Answer: B
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Use the fundamental identities to simplify the expression.cos x tan x
A. 1 B. cos x C. sin x D. cot x
Provide an appropriate response.Identify which of the following properties apply to the graph of 
I. The domain is all real numbers except integer multiples of ?. II. The range is (-?, -1] ? [1, ?). III. The equations of the vertical asymptotes are 
, where n is an odd integer. IV. The x-intercepts are of the form 
where n is an integer.
A. II and IV B. I and III C. I only D. III and IV
Find the probability.A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. What is the probability of choosing a marble that is not blue?
A. 
B. 
C. 8
D. 
Perform the indicated operations. Express the answer as a single polynomial in standard form.11x2(-10x + 11)
A. 11x2 B. -110x3 + 11 C. -110x3 + 121x2 D. -110x + 121