The cost of gasoline varies directly with the number of gallons bought. If 4 gallons of gasoline cost $16.80, find the cost of 15 gallons.
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(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Two line segments are shown in the figure below. suppose that the length of the line along the x-axis is 6, and the length of the hypotenuse of the triangle is 10. what is the equation of the hypotenuse line (shown in red, below)?