Eliminate the parameter t. Find a rectangular equation for the plane curve defined by the parametric equations.x = 7 sin t, y = 7 cos t; 0 ? t ? 2?
A. y = 
= 49; -? < x < ?
B. y2 - x2 = 49; -? < x < ?
C. y = x2 - 9; -2 ? x ? 2
D. x2 + y2 = 49; -7 ? x ? 7
Answer: D
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Solve the equation.0.43x + 0.4(8,000 – x) = 3350
A. x = 5,000 B. x = 3,000 C. x = –3,000 D. x = 8,000 E. no solution
For the pair of functions, find the indicated sum, difference, product, or quotient.f(x) = x + 7, g(x) = 
Find (f - g)(-7).
A. does not exist
B. 0
C. 
D. 
Solve the problem.The following information on Company X appears in a stock table.
Find the amount received by the seller of 9900 shares of Company X at the day's closing price. Deduct sales expenses which consist of the broker's commission and SEC fee. Assume that the transaction is automated (phone) and that the discount broker's commissions are as follows, using Firm C: ?
A. $321,750.00 B. $321,728.93 C. $321,707.89 D. $321,729.93
Determine whether the graph opens upward or downward.y = x2 - 5
A. Upward B. Downward