What is the algebraic rule for a figure that is rotated 270° counterclockwise about the origin?
a. ro,–270°(x, y) → (–y, x)
b. ro,–270°(x, y) → (x, –y)
c. ro,270°(x, y) → (–x, –y)
d. ro,270°(x, y) → (y, –x)

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?

To prove that angle def = angle dgf by sas, what additional information is needed? def congruent to dgf dfe congruent to dfg de congruent to dg dg congruent to gf

What makes a trapezoid an isosceles trapezoid?