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Irina-Kira [14]
2 years ago
15

PLEASE HELP! only 48 mins left!

Mathematics
1 answer:
Agata [3.3K]2 years ago
7 0

Answer:

-3.75

Step-by-step explanation:

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f a rectangle has a perimeter of 70, a length of x and a width of x - 9, find the value of the length of the rectangle.
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Solve -5sqrtx = -15.<br><br> A. x = -9<br> B. x = 7<br> C. x = 9<br> D. x = -7
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Check this attachment

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There are two formulae you can use to calculate the number of apple trees and the number of conifer
Leno4ka [110]

9514 1404 393

Answer:

  n = 8

Step-by-step explanation:

"By inspection" is an appropriate method.

We are asked to compare the expressions

  n·n

  8·n

and find the value(s) of n that makes them equal. <em>By inspection</em>, we see that n=8 will make these expressions equal. We also know that both expressions will be zero when n=0.

__

More formally, we could write ...

  n^2 = 8n . . . . the two formulas give the same value

  n^2 -8n = 0 . . . . rearrange to standard form

  n(n -8) = 0 . . . . . factor

Using the zero product rule, we know the solutions will be the values of n that make the factors zero. Those values are ...

  n = 0 . . . . . makes the factor n = 0

  n = 8 . . . . . makes the factor (n-8) = 0

Generally, we're not interested in "trivial" solutions (n=0), so the only value of n that is of interest is n = 8.

__

A lot of times, I find a graphing calculator to be a quick and easy way to find function argument values that make expressions equal.

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