Solve the problem.An element decays at the rate of S(t) = se-0.022t, where s is the initial amount in grams and t is the time in years since this initial amount was present. If you have a 89-gram piece of this element, how many grams will you have 4 years from now? Round to the nearest tenth of a gram.
A. 81.5 g
B. 97.2 g
C. 43.5 g
D. 0.9 g
Answer: A
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Perform the operation indicated.
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A. 
B. 
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Determine the two equations necessary to graph the ellipse with a graphing calculator.
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= 1
A. y = 
and y = -
B. y = 
and y = - 
C. y = 
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D. y = 
and y = - 
Graph the function.y = -cot (?x)
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Find the tax in the following application problems. Use $4050 for each personal deduction, a standard deduction of $6300 for single taxpayers, $12,600 for married taxpayers filing jointly, $6300 formarried taxpayers filing separately, and $9300 for head of household and the tax rate schedule.
Lilly Donaldson had wages of $31,706, other income of $2,962, dividends of $213, interest of $328, and a regular IRA contribution of $839 last year. She had deductions of $1,271 for state income tax, $1,440 for property tax, $1,460 in mortgage interest, and $713 in contributions. Donaldson claims three exemptions and files as head of household.
A. $-114,399.60 B. $1,275.50 C. $1,870.00 D. $393.00