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morpeh [17]
3 years ago
8

This question please

Mathematics
1 answer:
AlexFokin [52]3 years ago
3 0

19^2 + x^2 = 21^2

19^2 = 361

21^2= 441

361 + x^2 = 441

x^2 = 441-361 = 80

x = sqrt(80) = 8.944 round to nearest tenth = 8.9

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If f(x) = 2^x + 4 and g(x) = x^2 – 4 what is the value of f(5) +g(-3)
Anon25 [30]

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3 years ago
PLZ HELP 25 POINTS AND WILL MARK BRAINLIEST <br><br><br> Divide 3/4 ÷ 1/8 = ____.
faust18 [17]

Answer:

6

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3/4 ÷ 1/8

Copy dot flip

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3 0
3 years ago
Read 2 more answers
Pls help, 20 points!!
klemol [59]

Answer:

(-18,9)

Step-by-step explanation (work shown in picture attached):

1) The first step in solving by substitution is to isolate the y-term in one of the equations if it is not already isolated. Isolate y in the first equation by dividing both sides by -2. This leaves us with the equation y = \frac{-x}{2}

2) Now, substitute \frac{-x}{2} for the y in the second equation. Simplify and isolate x. (You can multiply everything by -2 to get rid of the fraction.) This leaves us with x = -18.

3) We've found the x-value of the solution, -18. Now, substitute -18 for x back into one of the original equations (I chose the first one because it was simple) and isolate y. This gives us y = 9. Thus, in point form, the answer is (-18,9).

7 0
3 years ago
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