A triangle has the coordinates

A( 4, –1), B(3, –3), and C(0, 2).

Reflect the triangle over the y-axis and find the coordinates of its image.

A(4, −1) → A'(
,
)

B(3, −3) → B'(
,
)

C(0, 2) → C'(
,
)

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?