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3 years ago

PLEASEEEEEE HELPPPPPPPP

1 answer:

8 0

The formula for the sum of n terms in an arithmetic progression is:
S = n/2 * (2a + (n-1)d)
Here, the common difference, d, is 8 and the first term, a, is 1. Substituting these into the formula, we get:

S = n/2 * (2*1 + 8(n - 1))
S = n + 4n² - 4n
S = 4n² - 3n
The answer is A.

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Nina is putting money into a checking account. Let y represent the total amount Of money in the account in dollars let X represe

Degger [83]

y=550+30?x this doesnt make sense

5 0

3 years ago

PLEASE ANSWER THIS . Goran's company makes solid balls out of scrap metal for various industrial uses. For one project, he must

Ainat [17]

Cost of aluminum required to make a ball of radius 7.5 inches is $ 161.71

<h3><u>Solution:</u></h3>

Given that

Goran's company makes solid balls out of scrap metal for various industrial uses.

For one project, he must make aluminum balls that have a radius of 7.5 inches.

Cost of aluminum = $0.12 per cubic inches

Need to determine cost of aluminum to make one ball.

Lets first calculate the volume of one ball

As shape of the ball is sphere , we can use volume of sphere formula

$\text {Volume of ball }=\text { Volume of sphere }=\frac{4}{3} \pi r^{3}$

Where "r" is the raius of ball

Given that radius of required ball = 7.5 inches

$\text { So, volume of ball of radius } 7.5 \text { inches }=\frac{4}{3} \pi \times 7.5^{3}$

$=\frac{4}{3} \times 3.14 \times 321.875=1347.5833 \text { cubic inches }$

So quantity of aluminum required is same as volume of ball = 1347.5833 cubic inches

Cost of aluminum for 1 cubic inch = $0.12

<em><u>So cost of aluminum required to make a ball of aluminium of 1347.5833 cubic inches is given as:</u></em>

$=0.12 \times 1347.5833=\$ 161.71$

8 0

3 years ago

4(2n + 3) =44 pls someone help me with this??

Whitepunk [10]

Answer:

n = 4

Step-by-step explanation:

4(2n + 3) = 44

Expand the brackets.

4(2n) + 4(3) = 44

8n + 12 = 44

Subtract 12 on both sides.

8n + 12 - 12 = 44 - 12

8n = 32

Divide both sides by 8.

(8n)/8 = 32/8

n = 4

6 0

3 years ago

A file server costs $30,000

Digiron [165]

Answer:

30,000 - 20% =24,000 year 1

24,000 - 20% =18,000 year 2

18,000 - 20% =12000 year 3

12,000 is your answer B)

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

I'm so confused about solving by substitution.

Komok [63]

Answer:

x = 3

y = 2

Step-by-step explanation:

Given

y = -2x + 8

y = x - 1

Substitute x - 1 for y in the first equation

We have

y = -2x + 8

x - 1 = -2x + 8

Add 1 to both sides to eliminate 1 on the left side

x - 1 + 1 = -2x + 8 + 1

x = -2x + 9

Add 2x to both sides to eliminate 2x on the right side

x + 2x = -2x + 2x + 9

3x = 9

Divide both sides by 3 to isolate x

3x/3 = 9/3

x = 3

Now substitute 3 for x in either equations to get y

Using the second equation, we have

y = x - 1

y = 3 - 1

y = 2

x = 3 and

y = 2

6 0

3 years ago