13) Suppose a penicillin dose of 9000 units per kilogram of body weight, taken every 6 hours, is prescribed for treatment of a bacterial infections. For penicillin, 400,000 units is equal to 250 mg . a. Express the dose in milligrams per kilogram \( (\mathrm{mg} / \mathrm{kg}) \) of body weight. b. How many milligrams of penicillin would a 20-kilogram child take in one day?

Question 3 An exponential function \( f(x)=a b^{x} \) passes through the points \( (0,11000) \) and \( (3,8019) \). What are the values of \( a \) and \( b \) ? \( a=\square=\square \) Question Help: Video Submit Question

1. Un tio se vio en la necesidad de comprar una estufa, una lavadora y un refrigerador por que los anteriores se le echaron a perder en una tormenta pasada, la lavadora le costo \( \$ 3,500 \) mas que la estufa y el refrigerador le costo \( \$ 4,750 \) mas que la lavadora, cuanto le costo cada articulo si en total gasto \( \$ 25,300 \).

Factor the binomial completely. \( 8 m^{3}+216 \)

Factor the binomial completely. \[ x^{7}-x^{3} \]

Given \( f(x)=-8(x-2)^{3}(x-5)^{5}(4 x+3)^{4}(x+5)^{3} \) List the zeroes (ex. \( 4,6,-2): \) Degree: End behavior: \[ \text { As } x \rightarrow-\infty, f(x) \rightarrow \text { Select an answer } v \] As \( x \rightarrow+\infty, f(x) \rightarrow \) Select an answer \( v \) Next Question