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2 years ago

Algebra 1 need help ASAP

Mathematics

1 answer:

Marina86 [1]2 years ago

6 0

Answer:

Add 1 to both sides.
Distribute the 4
Subtract 8 from both sides
Divide both sides by 12

I hope this helps!

pls ❤ and give brainliest pls

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Find the radius of a circle which has a sector area of 9 pi whose central angle is 90 degrees.

Greeley [361]

Answer:360/90 = 4

Total area = 4 times that of the sector.

Step-by-step explanation:

A 90 deg sector has 1/4 the area of the circle.

Total circle area = 4*9pi = 36pi

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2 years ago

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*Find the formula of the series 1+2²+3²+4²+....+n²*<br>

Sophie [7]

The formula is $\frac{n(n+1)(2n+1)}{6}$

What are series?

In mathematics, we can describe a series as adding infinitely many numbers or quantities to a given starting number or amount.

We will find the formula as shown as below:

Let $S=1+2^2+3^2+4^2+................+n^2$

We know $(n+1)^3=n^3+3n^2+3n+1$

$(1+1)^3=1^3+3(1)^2+3(1)+1$

$(2+1)^3=2^3+3(2)^2+3(2)+1$

$(3+1)^3=3^3+3(3)^2+3(3)+1$

$(n+1)^3=n^3+3(n)^2+3(n)+1$

On adding

$2^3+3^3+4^3......(n+1)^3=(1^3+2^3+3^3+.....+n^3)+3(1^2+2^2+.....+n^2)+3(1+2+3....n)+(1+1+1+....+1)$

$2^3+3^3+4^3......(n+1)^3-(1^3+2^3+3^3+.....+n^3)=3S+\frac{3n(n+1)}{2}+(1+1+1+....+1)$

$(n+1)^3-1^3=3S+\frac{3n(n+1)}{2} +n$

$n^3+3(n)^2+3(n)+1-1=3S+\frac{3n(n+1)}{2} +n$

$2n^3+6n^2+6n=6S+3n^2+3n+2n$

$6S=2n^3+3n^2+n$

$6S=2n^2(n+1)+n(n+1)$

$6S=(n+1)(2n^2+n)$

$6S=n(n+1)(2n+1)$

$S=\frac{n(n+1)(2n+1)}{6}$

Hence, the formula is $\frac{n(n+1)(2n+1)}{6}$

Learn more about Series here:

brainly.com/question/24643676

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2 years ago

Select the correct answer

Nady [450]

Answer:its 5/2 <100

Step-by-step explanation:

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2 years ago

Tell whether the side lengths 18, 24, and 30 would form a right triangle?*

allochka39001 [22]

Answer:

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2 years ago

712,350 nearest hundred thousand

soldi70 [24.7K]

1. The number 7 is located in the hundred thousands place

2. Since the number 1 is located in the ten thousands place, it's telling 7 to stay the same

Stays the Same: 1,2,3,4
Goes Up: 5,6,7,8, etc...

712,350 ⇒ 700,000

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3 years ago

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