Answer:

42 sq. Units

Step-by-step explanation:

I took the test

The first answer is 80, and the second answer is still 65.5. Hope this helps!

The first step is to quickly factor each of the five equations... to do so, find the right factors of the 3rd given number so that they add up in an equal number to the second number... 14 = -7 • -2 and -9 = -7 + -2

a^2 - 9a + 14 = 0

(a - 7) (a - 2)

a - 7 = 0, a = 7

a - 2 = 0, a = 2

{2,7}

a^2 + 9a + 14 = 0

(a + 7) (a + 2)

a + 7 = 0, a = -7

a + 2 = 0, a = -2

{-2, -7}

a^2 + 3a - 10 = 0

(a + 5) (a - 2)

a + 5 = 0, a = -5

a - 2 = 0, a = 2

{-5, 2}

a^2 - 5a - 14 = 0

(a - 7) (a + 2)

a - 7 = 0, a = 7

a + 2 = 0, a = -2

{-2, 7}

There must be More details for the problem

Answer:

D = 48kg

Step-by-step explanation:

The ratio of the weights of A and B is equal to the ratio of the weights

of C and D.

From the above question

A : B = C : D

This can also be interpreted as

A/B = C/D

A is 20 kg

B is 24kg

C is 40kg

D is ?

Therefore:

20/24 = 40/D

Cross Multiply

20D = 24 × 40

D = 24 × 40/20

D = 48

Therefore, D = 48kg