Express the trigonometric function in terms of the same function of a positive acute angle.sin 261°
A. sin 81°
B. -sin 81°
C. -sin 36°
D. sin 36°
Answer: B
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Find the opposite of the number.1.2
A. 2.1 B. -1.2 C. -2.1 D. 1.2
Solve the problem.A salesperson gets a commission of $1000 for the first $10,000 of sales, and then $500 for each additional $10,000 or partial of sales. Let S(x) represent the commission on x dollars of sales. Find the value of 
A. $2750 B. $3000 C. $2250 D. 3250
Simplify the expression. Assume that all variables are positive when they appear.-9
+ 6
A. 21
B. -3
C. -21
D. 39
Solve the problem.If the density of a substance is 6.95 × 10-5 tons per cubic foot, what would be the mass of 9.85 × 10-6 cubic feet of this substance. (Use the formula D = 
and round to the nearest hundredth, if necessary.)
A. 6.85 × 10-11 tons B. 6.85 × 10-10 tons C. 0.68 × 10-10 tons D. 6.85 × 10-9 tons