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

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5