Mr. Yang purchased 5 pounds of grapefruit for $4.90. At this price, how much will 7 pounds of grapefruit cost? A
$0.98
B
$3.50
C
$6.86
D
$7.98

What is the fewest number of full weeks briyana would have to work to have enough money? 8 weeks9 weeks 10 weeks11 weeks

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?

I'm confused on how to solve the triangle. can someone me ?