Johnny and Samantha are going to a water park and an amusement park. They can only spend a total of 15 hours at the two parks combined. Concessions cost $5.00 at the water park and cost $3.80 at the amusement park. They can only buy one concession an hour and can only spend a total of $63.00 on food and drinks.
Which system of inequalities can be used to determine the number of hours Johnny and Samantha can spend at the water park (w) and the amusement park (a)?
A. w + a < 15
$5.00w + $3.80a < $63.00

B. w + a < 15
$3.80w + $5.00a < $63.00

C. w + a > 15
$5.00w + $3.80a < $63.00

D. w + a > 15
$5.00w + $3.80a > $63.00

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.

What’s the volume of the triangular prism?

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.