Work out the surface area of this cylinder.
Radius-7 cm
Height-12 cm

226pi

Step-by-step explanation:

2 * pi * 7 *(7+12)

The surface area of this cylinder. is 266π  cm²

Step-by-step explanation:

Surface Area of Cylinder (SA) = 2πrh+2πr²

       since r =  7cm  & h = 12 cm

Then SA  = 2 π (7)(12) + 2π(7²)

         SA  = 168π  +  98π

     ∴  SA  = 266π  cm²

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

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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step-by-step explanation: