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VARVARA [1.3K]
4 years ago
5

Students are to march in a parade. There will be one first grader, two second graders, three third graders, and so on, through t

he twelfth grade. How many students will march in the parade?
Mathematics
1 answer:
Lana71 [14]4 years ago
4 0
1+2+3+4+5+6+7+8+9+10+11+12=78
The answer is 78
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Samantha found a great deal on sweatshirts at the mall and bought 5 sweatshirts at the
dexar [7]

Answer:

$40

Step-by-step explanation:

You have two sweatshirts that cost $30 more the day after.

First, you do 340 -(2*30)

Second, you divide what you got above ($280), by 7 and voila, you have $40 per sweatshirt.

5 0
3 years ago
Find the values of x for which the series converges. (enter your answer using interval notation.) ∞ (x + 9)n n = 1 find the sum
Naddika [18.5K]
If the series is

\displaystyle\sum_{n=1}^\infty(x+9)^n


then it is geometric, which we know converges as long as the base is smaller than 1 in absolute value, i.e. |x+9|. "Expanding" the absolute value, this is equivalent to

-1

When x is in this interval, the geometric sum converges to

\displaystyle\sum_{n=1}^\infty(x+9)^n=\frac1{1-(x+9)}=-\frac1{x+8}
7 0
4 years ago
Answer correctly and I will mark you brainless ❤️
Fudgin [204]
The Answer is -9/8 mark brainliest
4 0
3 years ago
|28−x| =0<br> plz help show steps
eimsori [14]

Answer:

x=28

Step-by-step explanation:

|28-x|=0

|28-28|=0

x=28

8 0
4 years ago
A small can of paint was 1/2 of a liter. That was enough to fill 1/4 of a paint sprayer .How many cans of paint would it take to
adoni [48]
I believe it's 4. 1/2 = 1/4 
so, 1/2 + 1/2 + 1/2 + 1/2 would be 4/4...
5 0
4 years ago
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