Question

B Rearrange the formula D=wp + 4 to make p the subject.

Use your formula to work out the value of p when D = 100 and w=12.​

Answer 1

Dp/(wp+4)=p

Explanation:

Number 1 D=wp+4

p×D=wp×p+4×p

=Dp=wp²+4p

=Dp=p(wp+4)

=from here you will divide both sides (wp+4) to get your answer

Number 2. 100p/(12p+4)=p

so from here 4 will divide 100 25 times leaving the answer 25p/12p=p

Answer 2

8

Explanation:

D=wp+4

D-4=wp

D-4/w=p

p=100-4/12

p=96/12

p=8