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A cooling machine starts cooling the room at the rate of 5°C per hour. If the temperature of the
room is 28°C find the number

By Clara

A cooling machine starts cooling the room at the rate of 5°C per hour. If the temperature of the
room is 28°C find the number of hours it takes to lower down the room temperature to -7° C.​

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Clara

List the numbers, within the curved brackets:
(i)r S4, XEN
(ii) -5 <x<-2, xe I
(ii) 4< x < 4,x e Z

ABCD is a cyclic quadrilateral.AB and DC when produced,met each other at the point P outside the circle.Prove that PA:PC equal to

1 thought on “A cooling machine starts cooling the room at the rate of 5°C per hour. If the temperature of the<br />room is 28°C find the number”

  1. Answer:

    A cooling machine starts cooling the room at the rate of 5°c per hour .

    Let x be the Hours

    The room temperature is 28°c.

    28°c +7°c =35°c

    5°c/ hour= 5×1 = 5°c

    5 ×(X)= 35°c

    X=35°C÷ 5

    X=7 hours

    The machine takes 7 hours to lower down the room temperature to -7°c.

    Thank you

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