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Lubov Fominskaja [6]
3 years ago
14

19. 4x²y(x + 2) - x(xy2 – 3)​

Mathematics
1 answer:
natima [27]3 years ago
6 0
4x^2y(x+2)-x(xy2-3)
(4x^2y)^(x)+(4x^2y)(2)-x^2y^2+3x
4x^3y+8x^2y-x^2y^2+3x
4x^3y-x^2y^2+8x^2y+3x
This was very confusing to solve so sorry if I’m wrong.Also sorry if it’s too hard to write it.
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I have no clue how to solve. Need help ASAP
agasfer [191]

Answer:269

Step-by-step explanation:

8x18=144

6x10=60

9x5=45

5x4/2=10

5x4/2=10

144+60+45+10+10=269

8 0
3 years ago
write the equation for an exponential function, in the forms y = a x b^x, whose graph passes through the coordinate points (1, 7
zysi [14]
Y = abˣ
(a ≠ 0, b ≠ 0)

(1, 7.5)
x = 1
y = 7.5
    ↓
7.5 = ab

(3, 16.875)
x = 3
y = 16.875
        ↓
16.875 = ab³

   7.5 = ab
     b      b
7.5/b = a

    16.875 = ab³
         b³        b³
16.875/b³ = a

     7.5/b  = 16.875/b³
7.5/b(b³) = 16.875/b³(b³)
     7.5b² = 16.875
      7.5         7.5
          b² = 2.25
      √(b²) = √(2.25)
           b = 1.5

a = 7.5/b
a = 7.5/1.5
a = 5

y = 5(1.5)ˣ
8 0
4 years ago
Read 2 more answers
he American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 45 w
Sonja [21]

Answer:

The 85% confidence interval is (0.2187, 0.2613).

Step-by-step explanation:

We have a large sample of size n = 830 Americans over 45. We have observed that 631 people don't smoke. Let p be the population proportion of Americans over 45 who smoke. An point estimate of p is \hat{p} = 199/830 = 0.24 and an estimate of the standard deviation of \hat{p} is \sqrt{\hat{p}(1-\hat{p})/n} = \sqrt{(0.24)(0.76)/830} = 0.0148. Therefore, because we have a large sample, the 85% confidence interval for the population proportion is given by \hat{p}\pm z_{\alpha/2}\sqrt{\hat{p}(1-\hat{p})/n} = 0.24\pm z_{0.15/2}0.0148 = 0.24\pm z_{0.075}0.0148 where z_{0.075} is the 7.5th quantile of the standard normal distribution, i.e., -1.4395. Therefore the 85% confidence interval is 0.24\pm (1.4395)(0.0148) or equivalently (0.2187, 0.2613).

7 0
3 years ago
Ratios equvilant to 7/5
Makovka662 [10]
3.5/2.5
14/10
21/15
28/20
4 0
3 years ago
Read 2 more answers
What is f(x) = 14 - 0.5x<br> f (30) =
Nookie1986 [14]
The answer is 405 because 14-0.5=13.5 and 13.5x30=405
5 0
3 years ago
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