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kipiarov [429]
3 years ago
12

4th grade math! Please help.

Mathematics
2 answers:
monitta3 years ago
5 0

Answer:

36 IN

Step-by-step explanation:

Elena L [17]3 years ago
3 0

Answer:

number 4 is 32

Step-by-step explanation:


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Solve the question: (-4)+(-1)+2+5+...+x=437
Alex Ar [27]
The sequence is an arithmetic sequence with
a₁ = -4

d = a₂ - a₁
d = -1 - (-4)
d = -1 + 4
d = 3

an = x

Sn = 437


General formula in arithmetic sequence
Formula to find nth term
an = a₁ + d(n - 1)
Formula to find sum of sequence (sn)
Sn = n/2 (a₁ + an)

We have to make an equation system based on the problem
plug the numbers into the formula
First equation
an = a₁ + d(n - 1)
x = -4 + 3(n - 1)
x = -4 + 3n - 3
x = 3n - 7

Second equation
Sn = n/2 (a₁ + an)
n/2 (a₁ + an) = 437
n/2 (-4 + x) = 437
n(x -  4) = 874
xn - 4n = 874

Solve the equation system by subtitution method
Subtitute x with 3n - 7 in the second equation
xn - 4n = 874
(3n - 7)n - 4n = 874
3n² - 7n - 4n = 874
3n² - 11n - 874 = 0
(3n + 46)(n - 19) = 0
n = -46/3 or n = 19
Because the number of terms shouldn't be negative, -46/3 isn't required, so the value of n is 19.

Solve for x, back to the first equatin
x = 3n - 7
x = 3(19) - 7
x = 57 - 7
x = 50

The solution is 50
6 0
3 years ago
Two hundred thousand twenty five
iris [78.8K]

confused as to what you want but if you want to see the number then its 200,025

8 0
3 years ago
Read 2 more answers
I need help please...
Olegator [25]

Answer:

13000 milliliters

Step-by-step explanation:

1 liter = 1000 milliliters

13 liters = 13000 milliliters

7 0
3 years ago
Read 2 more answers
Plssss I need help Im in classsss plsss
Sav [38]

Step-by-step explanation:

Y=-4x+3

2x+3y=19

2x+3(-4x+3)=19

2x-12x+9=19

-10x=10

X=-1

y=-4*(-1)+3=4+3=7

x=-1 y=7

5 0
3 years ago
Put Y=x^2+10x+18 in vertex form
nika2105 [10]

Answer:(-5,-7)

Step-by-step explanation:

Rewrite in Vertex form and use this form to find the vertex (h,k)

4 0
3 years ago
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