Question

C)

Answer 1

Answer:

d)25cm,20cm

c)6,3

Step-by-step explanation:

d)P=2(l+b)

90=2(l+b)

l+b=90/2

l+b=45

A=l×b

500=lb

l=45-b

500=(45-b)b

500=45b-b²

b²-45b+500=0

b²-25b-20b+500=0

b(b-25)-20(b-25)=0

(b-20)(b-25)=0

b=20 or b=25

c)a×b=18

a+b=9

a=9-b

(9-b)b=18

9b-b²=18

b²-9b+18=0

b²-6b-3b+18=0

b(b-6)-3(b-6)=0

(b-3)(b-6)=0

b=3 or b=6

Answer 2

Answer:

d)2cm,d)20cm

c)6,3 answer