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2 years ago

5

Yuson must complete 45 hours of community service. She does 3 hours each day. Which linear equation represents the hours Yuson h

as left after x days?

1 answer:

alukav5142 [94]2 years ago

5 0

Answer:

y=45-3x, where x=# of days, y=number of hours left, and 45=total # of hours.

Step-by-step explanation:

hours left= total - hours/day

we want y, so:

y=45-3x is the right answer

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The radius of a circle is 3 feet. What is the circle's area?

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aleksandrvk [35]

First you must have the quadratic equal to zero. In order to do this you must subtract 7 to both sides

x^2 + 20x + (100 - 7) = 7 - 7

x^2 + 20x + 93 = 0

Now you must find two numbers who's sum equals 20 and their multiplication equal 93

Are there any? NO!

This means that you have to use the formula:

$\frac{-b±\sqrt{b^{2} - 4ac} }{2a}$

In this case:

a = 1

b = 20

c = 93

$\frac{-(20) plus/minus\sqrt{20^{2} - 4(1)(93)} }{2*1}$

$\frac{-20 plus/minus\sqrt{400 - 372} }{2}$

$\frac{-20 plus/minus\sqrt{28} }{2}$

^^^We must simplify √28

√28 = 2√7

so...

$\frac{-20 plus/minus 2\sqrt{7} }{2}$

simplify further:

$-10 plus/minus\sqrt{7$

-10 + √7

or

-10 - √7

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2 years ago

Vermont produces about 430000 gallons of maple syrup each year how many 2 quart containers of Maple Syrup can be made from 43000

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3 years ago

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The sum of the two 5 digit numbers ABC10 + ABC12 is 123422. What is A + B + C?

Evgesh-ka [11]

Answer:

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Step-by-step explanation:

We are given with two $5\ digit$ numbers whose first $3 \ digits$ are same.

It is given that their sum is $123422$

adding the last two corresponding digits gives,

$0+2=2\\1+1=2$

Now adding the rest,

$C+C \ should\ be\ 14$ to get $4$

$1 \ carries\\B+B$ should not give anything to carry as that will make A in decimal to satisfy the addition.

Therefore,

$B+B \ has \ to \ be 1+1=2,+ 1 \ carry=3$

Thus $B= 1$

And finally,

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Thus $A=6, B=1 \ and \ C=7$

Now simplifying

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