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kondaur [170]
3 years ago
9

If y varies directly as x, and y = 75 when X = 25. Find x when y=21 PLEASE HELP ASAP

Mathematics
1 answer:
user100 [1]3 years ago
6 0
I think x would equal 7 because when y=75 and x=25, x is one third of y so one third of 21 is 7
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REY [17]
It 7 hours and 5 minutes to complete the race because it would be 8 times 50 which equals 400 and 400 plus 250 which equals 650 and 650 divided by 60 is 7.5 which is 7 hours and 5 minutes I believe so 7.5 is the answer.............
6 0
3 years ago
A geyser is a hot spring that periodically erupts a mixture of hot water and steam. Old Faithful in Yellowstone National Park is
vfiekz [6]

Answer:

Check the explanation

Step-by-step explanation:

Open file in excel.

Click on Data->Data Analysis and select Regression.

Enter wait time data range in y-variable.

Enter Duration data range in x-variable.

Click ok.

From above output:

#1 The equation of the linear regression line is:

A 95% confidence interval for the slope of the regression line is:

{(10.110,11.349)}

In excel, ise formula =FORECAST(6,wait time data range, duration data range) and press enter. The wait time between eruptions following a 6 minute eruption is \hat{Y}_{x=6}= 97.9} .

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The correct null and alternative hypotheses for this analysis:

{ H_0:\beta_1=0 \ H_a:\beta_1\ne 0}

Kindly check the output below

4 0
3 years ago
Please help area and perimeter of functions
nalin [4]

Answer:

= 150 square units

Step-by-step explanation:

Area of a right triangle is given by the formula;

1/2 bh ; where b is base and h is the height of the triangle

using Pythagoras  theorem, we can find the height;

h² = 20² - 16²

h = √144

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The base of the small triangle can also be found using Pythagoras theorem;

b² = 15² - 12²

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Therefore;

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5 0
3 years ago
Read 2 more answers
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Iteru [2.4K]

Answer:

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Step-by-step explanation:

(-x+3)-(x-5)=2x+8

(-x+3)+(-x+5)=2x+8

-x+3-x+5=2x-8

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-2x-2x=-8-8

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x=4

8 0
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Sergio039 [100]
False. You get billed by the end of the month the money is “borrowed” money from the bank until you have to pay it all back, if it’s not paid on time you have to pay extra (interest). With debit card your money is taken out immediately.
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2 years ago
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