40 percent of the students at rockledge middle school are musicians. 75 percent of those musicians have to read a sheet music when they play instruments. if 38 of the students can play their instruments whithout reading sheet music, how many students are there at rockledge middle school?

Step-by-step explanation:

40/100 musicians .75*40= 30

30 is to 100

as 38 is to x

30          38

  =                  Cross multiply

100          x

30x=3800

divide by three to get

126 and 2/3

you can't split people, so it would be closer to about 127 students.

b and c

step-by-step explanation:

step-by-step explanation:

consider the parallelogram shown in the attached image.

in the parallelogram hijk, the length of hk is given as,

from the properties of parallelogram we know that the opposite sides of a parallelogram are parallel to each other and are equal in measure.

therefore, the length of the side ij must be equal to the length of the side hk and that is .

hence, the expression for the length of ij confirms that hijk is a parallelogram.