Solve.Sand is poured carefully into a pile that forms a right circular cone as shown. The total surface area of a cone with slant height s and base radius r is the product of ? and the square of the radius added to the product of ?, the radius, and the slant height. Write an expression for the total surface area of the cone and then write the expression in factored form. ?
A. ?r2 + ?r2s = ?r2(1 + s)
B. ?r2 + ?rs = ?rs(r + 1)
C. ?r2 + ?rs = ?r(r + s)
D. ?r2 + ?rs = ?r(?r + s)
Answer: C
Mathematics
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Construct a truth table for the statement.r ? (r ? ~r)
A. 
| T | T |
B.
| T | F |
C.
| T | T |
D.
| T | F |
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Solve the problem.In a certain city, the cost of a taxi ride is computed as follows: There is a fixed charge of $2.95 as soon as you get in the taxi, to which a charge of $1.95 per mile is added. Find an equation that can be used to determine the cost, C(x), of an x-mile taxi ride, and use this equation to find the cost of a 5-mile taxi ride.
A. $12.58 B. $13.60 C. $12.88 D. $12.70
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Simplify.(-7x3y5)(5xy6)(-5x4y)
A. 175x8y12 B. -7x8y12 C. -7x12y30 D. 175x12y30
Mathematics
Determine whether the two matrices are inverses of each other by computing their product.
and 
A. No B. Yes
Mathematics