18. For every book Tony sells, he gets \( \$ 1.75 \) as commission. He gets additional \( \$ 1.50 \) for every 8 books sold. How many hooki did Tony ent he eamed \( \$ 50 \) in commission? \( \$ 1.75 \times 8=\$ 1200 \)

Write the expression as a sum and/or difference of logarithms. Express powers as factors. \( \ln \left(x^{4} \sqrt{2-x}\right), 0

Write the expression as a sum and/or difference of logarithms. Express powers as factors. \( \log _{7}(2401 \mathrm{x}) \) \( \log _{7}(2401 \mathrm{x})=\square \) (Type an exact answer in simplified form.)

In 2018 , the citizens of a country spent a total of \( \$ 73.6 \) billion on their pets. In 2015 , the citizens of the same country spent \( \$ 66.79 \) billion on their pets. Let \( y \) be the amount spent by those citizens on their pets in year \( x \), where \( x=0 \) represents the year 2015 . a. Write a linear equation that models the amount the citizens of the country spent on their pets in the year \( x \). [Hint: The line must pass through the points \( (0,66.79) \) and \( (3,73.6) \).] b. Use this equation to predict the amount citizens spend on their pets in 2027 .

Problema: Maria y Juan están organizando una fiesta y necesitan comprar refrescos y bocadillos. María compró 3 caj de refrescos y 5 bolsas de bocadillos por un total de \( \$ 45 \). Juan compró 2 cajas de refrescos y 3 bolsas de bocadillos por un total de \( \$ 29 \). 1. ¿Cuál es el precio de una caja de refrescos? 2Cuál es el precio de una bolsa de bocadilos?

\( 1-b a p \) (a) \( \frac{a}{4}+\frac{b}{4}= \)