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3 years ago

40 POINTS AND BRAINLIEST

Mathematics

1 answer:

Nataliya [291]3 years ago

3 0

Answer:

-110

Step-by-step explanation:

Going from x=1 to 2, y decreases by 3 from 7 to 4

Going from x =2 to 3, y decreases by 3 from 4 to 1

We subtract 3 each time x increases by 1

The formula for an arithmetic sequence is

an = a1 + d(n-1)

where a1 is the first term a1 =7

d is the common difference or what we add (which is in this case is -3)

n is the term number we are looking for n= 40

a40 = 7 -3(40-1)

a40 = 7 -3(39)

a40 = 7 -117

a40 = -110

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Compute 1 + 2 + 3 +....+ 1,997 + 1,998 + 1,999

sp2606 [1]

Answer:

1 999 000

Step-by-step explanation:

Formula:

$1+2+3+.\ .\ .+n=\frac{n\times \left( n+1\right) }{2}$

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Then

$1+2+3+....+1997+1998+1999=\frac{1999\times \left( 1999+1\right) }{2}$

$1+2+3+....+1997+1998+1999=\frac{1999\times \left( 2000\right) }{2}$

$1+2+3+....+1997+1998+1999=\frac{3998000 }{2}$

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1 year ago

How many ways can you arrange 10 numbers

kkurt [141]

Answer:

3628800

Step-by-step explanation:

There are 10 options for the first number.

That leaves 9 options for the second number.

That leaves 8 options for the third number.

So on and so forth.

The number of ways 10 numbers can be arranged is:

10×9×8×7×6×5×4×3×2×1

= 10!

= 3628800

8 0

3 years ago

What is 0.4 as a simplified fraction

mestny [16]

Answer: 2/5

Step-by-step explanation: Using the place value chart, we can see that the decimal 0.4 is four tenths, so we can write 0.4 as the fraction 4/10.

Notice however that 4/10 is not in lowest terms so we need to divide the numerator and the denominator by the greatest common factor of 4 and 10 which is 2.

So if we divide the numerator and the denominator by 2, we get the equivalent fraction 2/5.

Therefore, 0.4 can be written as the fraction 2/5 which is in lowest terms.

5 0

3 years ago

I need helpp please

IrinaK [193]

Answer:

Total is $138.75 which is answer D

Step-by-step explanation:

15*3.5= $52.50

15*5.75= $86.25

Total is $138.75

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2 years ago

Read 2 more answers

What are the coordinates of the intersection of the graphs of 3x - y^2 = 12 and y = -3

inessss [21]

Answer:

(7,-3)

Step-by-step explanation:

y = -3

substitute in the first equation

3x - y^2 = 12

3x - (-3)^2 = 12

3x - 9 = 12

3x = 12 + 9

3x = 21

x = 7

coordinates of intersection (7,-3)

3 0

2 years ago