Solve the problem.How much pure acid should be mixed with 6 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 9 gal
B. 15 gal
C. 24 gal
D. 3 gal
Answer: A
Mathematics
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Use the information below to determine the cardinality of the set. U = {q, r, s, t, u, v, w, x, y, z} A = {q, s, u, w, y} B = {q, s, y, z} C = {v, w, x, y, z}n(A ? B ? C)
A. 10 B. 1 C. 8 D. 9
Mathematics
Solve the problem.The difference between two complementary angles is 38°. What is the measure of the larger angle?
A. 26° B. 64° C. 52° D. 109°
Mathematics
Write the expression in terms of sine and cosine, and simplify so that no quotients appear in the final expression.
A. sec2? B. tan2? C. sin ? D. cos3?
Mathematics
Add.(5x2 - 2x - 5) + (-2x2 - 2x - 8)
A. 3x2 - 2x - 13 B. 3x2 - 4x - 13 C. 3x4 - 4x2 - 13 D. -10x2 - 2x - 13
Mathematics