Triangle PQR is similar to triangle DEF as shown.
6 cm
cm
P
6 cm
R
D
9 cm
Which describes the relationship between the corresponding sides of the two triangles?

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Tell whether the two rates form a proportion

8) during a clearance sale, a keyboard that normally sells for $49.99 is discounted for $34.99. what is the percent discount?