Question

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Answer 1

Step-by-step explanation:

For the 8b the answer is :- We know that PQ is 5, P is 45 and Q is 90 ,so, 5+45+90=140-5=135 because PQ is 5.Therefore,PR is 135.

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Answer 2

Answer:

9

perimeter of a square is X, it's length is X/4 so it's area is (X/4)^2 = X^2/16. So in order to find area of a square from it's perimeter, square perimeter value and divided it by 16. So if perimeter is 40 cm, it's area is 40×40/16 = 100 cm^2. To find the diagonal pythagoras theorem can be used. D^2 = (X/4)^2+(X/4)^2, D^2 = 2X^2/16, D^2 = X^2/8, D = X/2×rt2. So in order to find diagonal of square from perimeter, divide perimeter value by 2×rt2. So if perimeter is 40 cm, it's diagonal is 40/2×rt2 = 14.14 cm.

Area = 10×10 = 100cm^2

10

let's call our number x.

To write this question in equation form...

the sum (+)

of a number (x)

and it's square (x2)

is 30

x + x2 = 30

Let's set our equation equal to zero:

x + x2 = 30

x2 + x - 30 = 0

now we can use the quadratic formula to solve:

x = ([ ±√(1 - 4*1*-30)] / 2

x = -1/2 ±√(121)/2

x = -1/2 ±11/2

x = -0.5 ± 5.5

x = 5, -6

There are two solutions.

5+52 = 5 + 25 = 30

-6 + (-6)2 = -6 + 36 = 30

I only know this

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