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Novosadov [1.4K]
3 years ago
8

I dont know how to solve this problems

Mathematics
1 answer:
sasho [114]3 years ago
4 0
Which problem do you need help on? maybe I could help you
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V=πr2h

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7 0
2 years ago
Read 2 more answers
Please help Explanation will be appreciated thanks,
Genrish500 [490]

Answer: A; 6.3%

Step-by-step explanation:

Problem 1

For the first problem, we first want to find y so that we can plug it into the expression.

We can use elimination method for the system of equations to solve.

3x+3y=21

3x-y=5

We subtract both equations to eliminate x.

4y=16                                        [divide both sides by 4]

y=4

Now that we know y, we can plug it into the expression.

\frac{4}{2} -3                                         [divide]

2-3                                         [subtract]

-1

We know that the answer is A.

--------------------------------------------------------------------------------------------------------

Problem 2

For the second problem, we need to know how to calculate percent error. The formula for precent error is \frac{|measured-exact|}{exact} *100%. We know that the exact value is 80 because the buyer was supposed to given 80. 75 is the measured value because that was what the buyer was given.

\frac{|75-80|}{80} *100%                               [subtract]

\frac{|-5|}{80} *100%                                   [solve absolue value]

\frac{5}{80} *100%                                     [divide]

0.0625*100%                               [multiply]

6.25

Since the problem said to round to one decimal place, we know that the answer is 6.3%.

4 0
2 years ago
Please help asap!!<br> Answer this using a graphing method please!
Zepler [3.9K]

Answer:

the connection is at 4 on x axis and 5 on y axis, so the solutions are x=4; y=5

3 0
3 years ago
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