A dog food claims to make dogs coats shiner and healthier looking. A researcher wants to test the claims. They plan to randomly select pet store shoppers to participate and assign them to two groups. choose one:

-census

-cluster sampling

-convenience sampling

-simple random sampling

-stratified sampling

choose one:

-experiment

-observational study

-simulation

-survey

ab will be equal to

9x

$450 i think. hope this ☺

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