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B, the parabola is narrower.

Step-by-step explanation:

Given the parent square function: x^2.

A vertical stretch by a scale factor of 3 is made to transform x^2 into 3x^2.

A stretch makes the function narrower, a compression makes the function wider.

Therefore the parabola is narrower.

x=half

step-by-step explanation:

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,