» Jeffrey learned to sing a total of 10 pieces over the course of 5 weeks of voice lessons.
After 9 weeks of voice lessons, how many pieces will Jeffrey be able to sing, in total? Solve
using unit rates.

Jeffrey will be able to sing 18 pieces over 9 weeks

Step-by-step explanation:

5    9

10   x

5x = 90

x = 18

a

b

d

step-by-step explanation:

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.