Arectangular packet of drink has a width that is 2 cm less than its length.
its height is 4 cm more than its length.
(a) it is given that the length of the packet is m cm. write down an expression,
in terins of m, for the total surface area of the packet.
[2]

Step-by-step explanation:

Given that the length of the packet is cm.

Then the width being 2cm less than the length becomes and the height being 4 cm more than its length becomes

The total surface area of the rectangular packet is given by:

We expand to get:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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