He starts at a position that is 15 feet below sea level . he rises 9 feet , then descends 12 feet to take a photo of coral reef . write and evaluate an expression to find his position relative to sea level when he took the photo .

-15+9=(-6) -6+(-12)=(-18) His position is 18 feet below sea level.

the car was traveling 40 mph before it started skidding. ( 2 points ) 17. was the driver were her brakes working at 75% efficiency or better? ( 2 points ) yes 29.

step-by-step explanation:

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x