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Flura [38]
3 years ago
12

For the last three months Olivia saved $75, $95, and $84. What is the minimum amount she should save next month in order to save

an average of the least $90 per month for these 4 months?
Mathematics
1 answer:
goblinko [34]3 years ago
8 0
The answer is 106 dollars
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PLZ HELP!!! Use limits to evaluate the integral.
Marrrta [24]

Split up the interval [0, 2] into <em>n</em> equally spaced subintervals:

\left[0,\dfrac2n\right],\left[\dfrac2n,\dfrac4n\right],\left[\dfrac4n,\dfrac6n\right],\ldots,\left[\dfrac{2(n-1)}n,2\right]

Let's use the right endpoints as our sampling points; they are given by the arithmetic sequence,

r_i=\dfrac{2i}n

where 1\le i\le n. Each interval has length \Delta x_i=\frac{2-0}n=\frac2n.

At these sampling points, the function takes on values of

f(r_i)=7{r_i}^3=7\left(\dfrac{2i}n\right)^3=\dfrac{56i^3}{n^3}

We approximate the integral with the Riemann sum:

\displaystyle\sum_{i=1}^nf(r_i)\Delta x_i=\frac{112}n\sum_{i=1}^ni^3

Recall that

\displaystyle\sum_{i=1}^ni^3=\frac{n^2(n+1)^2}4

so that the sum reduces to

\displaystyle\sum_{i=1}^nf(r_i)\Delta x_i=\frac{28n^2(n+1)^2}{n^4}

Take the limit as <em>n</em> approaches infinity, and the Riemann sum converges to the value of the integral:

\displaystyle\int_0^27x^3\,\mathrm dx=\lim_{n\to\infty}\frac{28n^2(n+1)^2}{n^4}=\boxed{28}

Just to check:

\displaystyle\int_0^27x^3\,\mathrm dx=\frac{7x^4}4\bigg|_0^2=\frac{7\cdot2^4}4=28

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2 years ago
3a*12 can a variable be multiplied by a constant
Virty [35]
Yes it can be multiplied
6 0
2 years ago
How do I simplify the value of y= 200,000(1.06)15
Fudgin [204]

Answer:

For this, first you must multiply the exponent, which in this case is 1.06^15,

and this gives you 2.39655819.

You then multiply 2.39655819 by 200000.

y = 479311.638

4 0
3 years ago
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Alla [95]

Answer:

(-2,-1)

Step-by-step explanation:

y=2x+3

y=3x+5

so y=y

then:

2x+3=3x+5

3-5= 3x-2x

-2= X

x=-2

3 0
3 years ago
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Simple Quadratic Equation help please! worth 50 points :) ill be giving brainliest
GuDViN [60]

Answer:

x= -2 or -3

Step-by-step explanation:

Let's solve your equation step-by-step.

x^2+5x+6=0

Step 1: Factor left side of equation.

(x+2)(x+3)=0

Step 2: Set factors equal to 0.

x+2=0 or x+3=0

x=−2 or x=−3

just a rough estimate!

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