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iris [78.8K]
3 years ago
13

Please help meeeee ill mark brainlest

Mathematics
1 answer:
Butoxors [25]3 years ago
4 0

A(n)=-1+(n-1)2\\\\A(30)-\text{put n =30 into the equation}\\\\A(30)=-1+(30-1)2=-1+(29)2=-1+58=57\\\\Answer:\ 57

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Help with #2 it has to do with number 1 that is the polygon you need to find the area of it.
Katena32 [7]
Okay, it's the equation to how find area any other way. A=L×W

This means *picture above*

So then you count over each line meaning 1.
This means L=9 and a 1/2. Since its in between the 2 an 3 on the x-axis.
Now for W or width. It equals 3 since you can count 2 lines and one either ends of the polygon is 1/2 each this creates one when added together.

All you do from there is multiply 9 and 3. This should give you A=area.

8 0
3 years ago
Write the standard form for the scientific notation. please help fast!!!
jarptica [38.1K]

2.32\cdot10^3=2.32\cdot1,000=2,320\\\\4.2\cdot10^4=4.2\cdot10,000=42,000\\\\4.2\cdot10^{-2}=4.2\cdot0.01=0.042

Multiplication by 10ⁿ → move decimal n places to the right.

Multiplication by 10⁻ⁿ → move decimal n places to the left.

For n ∈ N

6 0
3 years ago
What is the rate of decay in the following function?<br><br> f(x)=3(67)^x
tigry1 [53]

Answer:

Suppose N is the size of a population of radioactive atoms at a given time t, and dN is the amount by which the population decreases in time dt; then the rate of change is given by the equation dN/dt = −λN, where λ is the decay constant.

5 0
2 years ago
Can someone please help me?
Lena [83]

Hey there!

We can solve systems two ways - substitution and elimination. It seems in this case that elimination is going to be easier.


Let's begin by multiplying the top equation by 3, and the bottom equation by 4:

3(5x - 4y = -24)

15x - 12y = -72


4(4x + 3y = 18)

16x + 12y = 72


Next, we'll add the two equations together to get rid of, or eliminate, the y variable and solve for the x variable:

(15x - 12y = -72) + (16x + 12y = 72)

31x = 0

x = 0


Next, we'll plug the value of the x variable into the top equation and solve for the y variable:

5(0) - 4y = -24

-4y = -24

y = 6


Therefore, x = 0 and y = 6.


Hope this helps!! :)

7 0
3 years ago
Write the standard form of 2 (4x - 1)(2x + 5)
kobusy [5.1K]

Answer:

16x^2+36x-10

Step-by-step explanation:

  2 (4x - 1)(2x + 5)

=2(8x^2-2x+20x-5)

=2(8x^2+18x-5)

=16x^2+36x-10

7 0
3 years ago
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