Estimate an answer to the problem.An advertisement states that television sets are on sale at B&G Electronics. The sale prices are:  set, $147.99; 19-inch set, $208.95;  set, $231.99;  set, $289.97;  set, $519.97. Estimate to the nearest ten how much more a 

style="vertical-align: -4.0px;" /> set costs than a  set.



A. $0

B. $10

C. $30

D. $20

---

Answer: D

Mathematics

Find the mass of the wire that lies along the curve r and has density ?.r(t) = 3i + (4 - 4t)j + 3tk, 0 ? t ? 2? ; ? = 8(1 + sin 2t)

A. 80 + 80? units B. 16? units C. 40 + 80? units D. 80? units

Solve the formula for the indicated variable.r =   for V

A. V = 
B. V = 3?r²h
C. V = 
D. V = 

Provide an appropriate response.Find the discriminant of the equation: 10 + 4x - x2 = 0

A. The discriminant value is 24i. B. The discriminant value is -24. C. The discriminant value is 56. D. The discriminant value is 48.

Insert parentheses as needed in the expression in order to make it equal to 0. More than one set of parentheses may be needed.8 + 4 ? 3 - 5

A. 8 + (4 ? 3) - 5 B. (8 + 4) ? 3 - 5 C. 8 + 4 ? (3 - 5) D. 8 + 4 ? 3 - 5