6. Shopping at Savers Mart, Lisa buys her children four shirts and three pairs of pants for \( \$ 85.50 \) . She returns the next day and buys three shirts and five pairs of pants for
\( \$ 115.00 \) . What is the price of each shirt and each pair of pants?
7.5
18.5
Find the solution of the exponential equation \( 16 e ^ { x } = 12 \) in terms of logarithms, or correct to four decimal places. \( x = \)
Certain radioactive material decays in such a way that the mass remaining after \( t \) years is given by the function
\( m ( t ) = 100 e ^ { - 0.01 t } \)
where \( m ( t ) \) is measured in grams. (a) Find the mass at time \( t = 0 \) . Your answer is (b) How much of the mass remains after \( 20 \) years? Your answer is Round answers to \( 1 \) decimal place.
