The mean is not the same thing as median
mean=78+81+85+87=331
mean=331/4=82.75
median is the middle number, but you have a par set of numbers, so your median will be the middle numbers 78,81,85,87 , which are 81+85=166, 166/2=83
83 is your median

5 0

3 years ago

A company is going to make an oil container in the shape of a cylinder. As shown below, the container will have a height of 7m a

olga2289 [7]

Step-by-step explanation:

For oil container in the shape of a cylinder

radius (r) = 6 m

height (h) = 7 m

TSA of Cylinder

= 2πr ( r + h)

= 2 * 3.14 * 6 ( 6 + 7)

= 2 * 3.14 * 6 (13)

= 2 * 3.14 * 6 * 13

= 489.84 square meter

Now,

the total cost of the steel will be $18,613.92.

= 18613.92/489.84

= $38

Thus, The TSA of a cylinder is 489.84 square meter and $38 will the steel cost per square meter.

5 0

3 years ago

Simplify this expression HELP ASAP

Sergio039 [100]

Answer:

Step-by-step explanation:

Noting the following rule of radicals

$\sqrt{a}$ × $\sqrt{b}$ = $\sqrt{ab}$

Given

( $\sqrt{2}$ + $\sqrt{3}$ )( $\sqrt{5}$ - $\sqrt{7}$ )

Each term in the second factor is multiplied by each term in the first factor

= $\sqrt{2}$ ( $\sqrt{5}$ - $\sqrt{7}$ ) + $\sqrt{3}$ ( $\sqrt{5}$ - $\sqrt{7}$ ) ← distribute parenthesis

= $\sqrt{10}$ - $\sqrt{14}$ + $\sqrt{15}$ - $\sqrt{21}$

8 0

3 years ago