Mathematics: Aplumber charges a flat fee of $79 to visit a home and examine a clogged drain. the plumber charges an additional $21 per hour spent fixing the drain. the total cost, c (in dollars), for fixing a drain that takes, h hours is given by the following function. c(h)=79+21h (a) what is the total cost for fixing a drain that takes 7 hours? (b) if the plumber charges a total of $310, how many hours did he spend fixing the drain?

Aplumber charges a flat fee of $79 to visit a home

Ответ:

sryun

30.05.2020

A) C=79+21(7)
That gives you an answer of $226

B) C= 310
310 = 79 + 21h
first subtract 79 from each side
231 = 21h
Then divide by 21 to isolate the hours
11=h

Hope this helps!

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Ответ:

2024056

05.11.2020

Mathematics

sin A = $\sqrt{1-x^{2} }$

Step-by-step explanation:

∵ABC is a right angled triangle at B

∴sin C = cos A

∴sin A = cos C

∵ $sin^{2}C+cos^{2}C=1$

∴ $cos^{2}C=1-sin^{2}C$

∴ $cosC=\sqrt{1-sin^{2}C }$

∵sin C = x

∴ $sinA=\sqrt{1-x^{2} }$

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