Given r(t) = 7t²i+4t³j.
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Solve the formula for the indicated variable. Then use the supplied values to solve the equation.The energy W stored by a capacitor is given by W = 
QV, where V is the voltage across the capacitor's terminals after Q coulombs of electricity have been transferred from one of the capacitor's plates to the other. Solve for Q. How many coulombs have been transferred if W is 0.47 watts and V is 15.8 volts? (All values are approximate.)
A. Q = 
= 3.7 coulombs
B. Q = 
= 0.059 coulombs
C. Q = 2WV = 15 coulombs
D. Q= W2V = 3.5 coulombs
Use a proportion to solve the problem.On April 26, 2005, 1 U.S. dollar was worth about 11.059 Mexican pesos. How much would 295 U.S. dollars be worth in Mexican pesos?
A. $26.08 B. $3218.45 C. $26.68 D. $3262.41
Write and solve an equation to answer the question. Round percent to the nearest thousandth, if necessary.Alex has saved $770 at the bank. He wants to accumulate $1750 for a trip to soccer camp. What percent of his goal has been reached?
A. 44% B. 20% C. 2% D. 0.44%
Find the equation of the tangent line to the curve when x has the given value.f(x) = x2 - 3 ; x = 2
A. y = 2x - 7 B. y = 4x - 14 C. y = 4x - 11 D. y = 4x - 7