11. \( \overline { C D } \) has coordinates \( C ( - 1,9 ) \) and \( D ( - 7,1 ) \) . of \( \overline { E F } \) is parallel to \( \overline { C D } , \) what is the slope
A. \( \frac { 3 } { 4 } \) B. \( \frac { 4 } { 3 } \)
C. \( - \frac { 3 } { 4 } \) D. \( - \frac { 4 } { 3 }\)
B. 4 / 3
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.
