The time, t(in minutes), you need to type a certain paper varies inversely with the rate, r (word per minute), that you can type. When typing 40 words per minute, you can finish in 50 minutes. Find the constant of proportionality and write and equation relating t and r.

the answer is c. 23/3

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step-by-step explanation:

the answer is:

the lateral area is equal to

to find the lateral area of the square pyramid, first we need to find the perimeter of the base, and then, find the lateral area using the following formulas:

where,

s, is the base length

slant height, is the height of a the side of the pyramid

we are given:

now, calculating the perimeter of the base, we have:

then, calculating the lateral area:

hence, we have that the lateral area is equal to

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