What fraction is equivalent to the expression
21
16
÷
7
4
?

The measurement of one angle of a right triangle is 34°. what is the measurement of the third angle?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz