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Gemiola [76]
3 years ago
5

I took a picture of 2 problems I need help with can someone help me please

Mathematics
1 answer:
Minchanka [31]3 years ago
7 0

1 is C not sure about 2

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Find a1 for the arithmetic series with s20 = 80 And d = 2
AfilCa [17]
We know that
the <span>formula of the arithmetic series  is
</span>Sn=<span>n[2(a1) + (n - 1)d]/2 
where
Sn=80
n=20
d=2
a1=?
then
80=20*[2*a1+19*2]/2----------------> </span>160=[40*a1+760]
160=[40*a1+760]----------> a1=(160-760)/40------------> a1=-15
<span>
the answer is
a1=-15

</span>
5 0
3 years ago
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Find the slope of the line that passes through the points (-6, -2) and (-7, -2)
SVEN [57.7K]
(-6, -2)/(-7, -2)
y-y/x-x
(-2- -6)/(-2- -7)
(-2+6)/(-2+7)
4/5 = slope
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3 years ago
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You need 320 mL of a 85% alcohol solution. On hand, you have a 60% alcohol mixture. How much of the 60% alcohol mixture and pure
Radda [10]

Answer:

Step-by-step explanation:

If we let x = the amount of 5% solution and y = the amount of pure alcohol, we can set up that

.05x+y is the amount of alcohol in our resulting mixture, and x+y is the total amount in our resulting mixture (which we know is 380)

so we also know that:

(.05x+y)/380 = .6

If we simplify this we come up with:

.05x+y=228

and we know x+y=380

If we solve this as a system of equations, we will find that:

x=160 ml

y=220 ml

5 0
3 years ago
How do i solve for this? 19-13p=-17p-5=
Vsevolod [243]
19-13p=-17p-5
+5                +5
24-13p=-17p
   +13p   +13p
24=-4p
/-4   /-4
-6=p
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3 years ago
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Which quadrant does the coordinate (-8, 12) lie?
marysya [2.9K]
In quadrant 2 is where it lies.
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2 years ago
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