Mature soil is composed of three layers the uppermost being topsoil jamal is planting a bush that needs an hole 18 cm deep for the roots. the instructions suggest an additional 8cm depth for cushion. if jamal wants to add mor cushion and the topsoil i. is yard 30 cm deep how much more cushions can he add and still remain on the topsoil layer?

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)

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