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katrin2010 [14]
2 years ago
9

Please answer both for 15 points

Mathematics
1 answer:
Debora [2.8K]2 years ago
8 0

Answer:

Hey look i am sorry for not doing them both i only know the second it is b 3000

Step-by-step explanation:

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If the value of "Y" varies directly with "X" and y=-8,when x=20,find "Y"if x=-4
kherson [118]

Answer:

y is 8/5 when x = -4.

Step-by-step explanation:

If the value of "Y" varies directly with "X", we can write y = kx, where k is the constant of proportionality.

If "y=-8,when x=20," then we can find k:    -8 = 20k, or k = -2/5.

Then y = (-2/5)x.

If x = -4, then y = (-2/5)(-4) = 8/5

y is 8/5 when x = -4.

6 0
3 years ago
1,743 divided bt 406
Vesna [10]

Answer:

After division we get the value  4.29310344828

Step-by-step explanation:

let x =1,743 ÷406

x= 1,743 ÷406

we get

x=4.29310344828

6 0
3 years ago
Read 2 more answers
A company estimates that it will sell ????(x) units of a product after spending x thousand dollars on advertising, as given by ?
zepelin [54]

Answer:

(11\frac{1}{3},20)

Step-by-step explanation:

If the Number of Sales of x units, N(x) is defined by the function:

N(x)=-5x^3+235x^2-3400x+20000,10\leq x\leq 40

N'(x)=-15x^2+470x-3400\\When -15x^2+470x-3400=0\\x=20, x=11\frac{1}{3}

Next, we text the critical points and the end points of the interval to see where the derivative is increasing.

N'(10)=-200\\N'(11\frac{1}{3})=0\\N'(19)=115\\N'(20)=0\\N'(40)=-8600

Thus, the rate of change of sales N'(x) is increasing in the interval (11\frac{1}{3},20) on 10≤x≤40.

7 0
3 years ago
Help please? Will mark correct and first answer as brainliest!! : )
Gelneren [198K]

Answer:

It Is O. 8

Step-by-step explanation:

Because you are suppose to round the number to the one in front of the other number

3 0
3 years ago
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When Mindy went to china, she exchanged $1 for 6.589 yuan. What digit is in the hundredths place of 6589?
mafiozo [28]

eight would be the answer

6 0
3 years ago
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