1. The diagonal length of a laptop computer screen is advertised as 45 cm. the width of the screen is 25 cm. Work out the length of the laptop computer screen. Give your answer to the 3 significant figures. a) 37.4 cm
b) 51.5 cm
c) 4.47 cm

a

Step-by-step explanation:

The diagonal is the hypotenuse of a right triangle with the width and length being the legs.

let l be the length

Using Pythagoras' identity in the right triangle , then

l² + 25² = 45²

l² + 625 = 2025 ( subtract 625 from both sides )

l²  = 1400 ( take square root of both sides )

l = ≈ 37.4 cm ( to 3 significant figures )

The length is approximately 37.4 cm

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: