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Choice B

Step-by-step explanation: Hello!

To find the length of KL, we will need to use the distance formula.

The distance formula is \sqrt{(x_{2}-x_{1})^{2} +(y_{2}-y_{1})^{2}}.

We are given K(4, 5) and L(4, -2), and we can find the distance between these two points through substitution.

\sqrt{(4-4)^{2} +(-2-5)^{2}}

\sqrt{(0)^{2} +(-7)^{2}}

\sqrt{(7)^{2}} = \sqrt{49} = 7

Therefore, the length of KL is 7 units, choice B.

c

step-by-step explanation:

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!