A graphing device is recommended. A 60 -gallon barrel is filled completely with pure water. Salt water with a concentration of \( 0.3 \mathrm{lb} / \mathrm{gal} \) is then resulting mixture overflows at the same rate. The amount of salt in the barrel at time \( t \) is given by \[ Q(t)=18\left(1-\mathrm{e}^{-0.07 t}\right) \] where \( t \) is measured in minutes and \( Q(t) \) is measured in pounds. (a) How much salt (in lb) is in the barrel after 9 minutes? (Round your answer to two decimal places.) (b) How much salt (in lb) is in the barrel after 18 minutes? (Round your answer to two decimal places.)

Given \( y=\frac{1}{5} x-3 \). What is the value of \( x \) when \( y=9 \) ?

Solve for \( z \) \[ 34 \geq 17 z \]

Point \( M \) is the midpoint of \( \overline{A B} \) where \( A M=3 x+8 \) and \( M B=6 x-4 \) Find \( A B \) \( A B=\square \).

Select all that apply Prenumbered forms are used for \( \square \) purchase orders \( \square \) invoices \( \square \) checks \( \square \) income statements

Suppose that two people are carriers for a genetically inherited disease such as cystic fibrosis and they are worried about whether their children will be healthy. Define "A" as being the dominant allele and "a" as the recessive abnormal allele that is responsible for cystic fibrosis. As a carrier, both people are heterozygous (Aa). The disease only afflicts those who are homozygous recessive (aa). Create a Punnett square that illustrates this situation.