Researchers compare the body composition of cattle feeding on a grain diet with that of cattle feeding on a grass diet. This method of gathering data is classified as a census.
a sample survey.
an experiment.
an observational study.

Solve the system of equations. y= 2x y= x^2 - 15

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Write two subtraction equations that are equivalent to 5 + 12 = 17.