Work the application. Write a legend and an equation. Solve the equation and answer in a complete sentence.Richard's team wants to plant 220 trees in 4 months. On average, how many trees per month do they need to plant?
A. Let t = the number of trees per month they need to plant.
220 ? t = 4
On average, they need to plant 65 trees per month.
B. Let t = the number of trees per month they need to plant.
220 = 4 ? t
On average, they need to plant 55 trees per month.
C. Let t = the number of trees per month they need to plant.
220 ? t = 4
On average, they need to plant 59 trees per month.
D. Let t = the number of trees per month they need to plant.
220 = 4 ? t
On average, they need to plant 110 trees per month.
Answer: B
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 85% of the isotope left?
A. 1,500 yr B. 813 yr C. 234 yr D. 750 yr
Solve the problem.The number of years since two independently evolving languages split off from a common ancestral language is approximated by 
where r is the percent of words from the ancestral language common to both languages now. What is 
A. 2154 years B. 215 years C. 2087 years D. 20,872 years
Solve the inequality. Graph the solution set and write it in interval notation.x + 5 < 12
A. (-?, 17)
B. (-?, 7)
C. (7, ?)
D. (-?, 17]
Solve the problem.A rose garden has 11 bushes in one row, 9 bushes in the next row, then 7, and so on. If there are 36 bushes in the garden, how many rows are planted?
A. 5 rows B. 6 rows C. 2 rows D. 7 rows