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Ira Lisetskai [31]
3 years ago
6

What is x???????????

Mathematics
1 answer:
Lerok [7]3 years ago
8 0

Answer:

x is the variable number

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Find S10 for -1 + -7 + -13 + -19
Alex777 [14]
First we find the common difference...to do this we subtract the first term from the second term. -7 - (-1) = -7 + 1 = -6

now we are going to find the 10th term
an = a1 + (n-1)*d <== formula for finding any term in arithmetic series
a1 = 1st term, d = common difference, n = term we want to find
now we sub
a10 = -1 + (10 -1) * -6
a10 = -1 + (9 * -6)
a10 = -1 - 54 
a10 = - 55

now we will find the sum
Sn = (n (a1+ an)) / 2 <== formula for finding the sum 
S10 = (10(-1 - 55))/2
S10 = (10(-56) / 2
S10 = -560/2
S10 = - 280

so the sum of the first 10 numbers is -280

4 0
3 years ago
Divide $150 into the ratio 2:5:3
pentagon [3]

Answer:

$30, $75, $45

Step-by-step explanation:

We can set up an equation, where x is an unknown value:

2x+5x+3x=150

10x = 150

x=15

Now that we know what x is, we can plug x in to solve for 2x, 5x, and 3x:

2x=2*15=30

5x=5*15=75

3x=3*15=45

Therefore, the answer is $30, $75, $45

5 0
2 years ago
Ayden is trying to lose weight to compete in a wrestling competition. In order to lose weight, he must burn more calories than h
docker41 [41]

Answer:

he must run 30 miles to burn 1200 calories

Step-by-step explanation:

8 miles = 320 calories

3 0
3 years ago
Adding 6 to triple a number gives 21
ivolga24 [154]

Step-by-step explanation:

Let the required number be x.

\therefore \: 3x + 6 = 21 \\

7 0
3 years ago
Read 2 more answers
Simply the expression below, assume the denominator does not equal zero
Hoochie [10]

Answer:

2x+1 / x +5

Step-by-step explanation:

8 0
3 years ago
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