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Pepsi [2]
3 years ago
5

Can anyone tell me how to do this? (Steps) and can you answer these two questions for me plz

Mathematics
1 answer:
Andrew [12]3 years ago
7 0
Ax²+bx+c=0

The formula to solve for x is:

x= \frac{-b(+/-) \sqrt{ b^{2}-4ac }  }{2a}


So for 3x²+13x+10=0, plug in the data

x=-13±√13²-4(3)(10) / 2(3)
x=-13±√169-120 / 6
x=-13±√49 /6
x=-13<span>±7 / 6

x=-13+7/6
x=-6/6
x=-1

x=-13-7/ 6
x=-20/6 or 3.3repeating

3x</span>²+14x+15=0
x=-14±√14²-4(3)(15) / 2(3)
x=-14±√196-180 /6
x=-14<span>±</span>√16 / 6

x=-14+4/6
x=-10/6 or 1.6repeating

x=-14-4/6
x=-18/6
x=-3

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bezimeni [28]
So first create and define your variables:
Z = amount of zebra fish
N = amount of neon tetras

Now create your equations:
2z+2.15n=31.20
z+n=15
This is your system. There are multiple methods to use but in this problem I’ll use the substitution method by simplifying the bottom equation.
2z+2.15n=31.20
z=15-n
Now I’ll plug the bottom equation into the top one.
2(15-n)+2.15n=31.20
And just solve from here.
30-2n+2.15n=31.20
0.15n=1.20
n=8
So he bout 8 neon tetras, and 15-8= 7, so he bought 7 zebra fish
6 0
3 years ago
Read 2 more answers
Find the circumference of a circle with a radius of 35 inches in terms of 7 and to the nearest tenth of an inch.​
Lera25 [3.4K]

Answer and Step-by-step explanation:

The circumference formula for a circle is:

C = 2\pi r

Plug 35 in for r (radius) and solve.

C = (35) 2\pi\\\\C = 70\pi\\\\C = 219.9

So, approximately 219.9 in^2 is the answer.

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The sides of a rectangle are enlarged by a scale factor of 2. Write
Dennis_Churaev [7]

Answer:

4

Step-by-step explanation:

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