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Lubov Fominskaja [6]
3 years ago
8

Help pls?????? With both !

Mathematics
1 answer:
MAXImum [283]3 years ago
5 0

Answer:

the answer could be 100 metre

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Please help! A chemist has 100ml of 25% acid solution. How much of the solution does she need to drain and replace with 70% acid
ratelena [41]

Answer:

77.78

Step-by-step explanation:

7 0
3 years ago
Factor 26r3s + 52r5 – 39r2s4.
algol [13]

Answer:

13r²(2rs + 4r³ - 3s⁴)

Step-by-step explanation:

In equation 26r³s + 52r⁵ - 39r²s⁴;

The GCF of 26, 52, and 39 = 13

The GCF of r³, r⁵ and r² = r²

The GCF of s, (no "s"), and s⁴ = no "s" (Since one of the number doesn't have "s")

Now we can factor out 13r² from all three expressions;

26r³s + 52r⁵ - 39r²s⁴

=> <em>13r²(2rs) + 13r²(4r³) - 13r²(3s⁴)</em>

To factor it all together;

<u>13r²(2rs + 4r³ - 3s⁴)</u>

Hope this helps!

7 0
2 years ago
Given the graph, find an equation for the parabola.
Sauron [17]

Answer:

\Large \boxed{\sf \bf \ \ y=\dfrac{1}{16}(a-3)^2-2 \ \  }

Step-by-step explanation:

Hello, please consider the following.

When the parabola equation is like

y=a(x-h)^2+k

The vertex is the point (h,k) and the focus is the point (h, k+1/(4a))

As the vertex is (3,-2) we can say that h = 3 and k = -2.

We need to find a.

The focus  is (3,2) so we can say.

2=-2+\dfrac{1}{4a}\\\\\text{*** We add 2. ***}\\\\\dfrac{1}{4a}=2+2=4\\\\\text{*** We multiply by 4a. ***}\\\\16a=1\\\\\text{*** We divide by 16. ***}\\\\a=\dfrac{1}{16}

So an equation for the parabola is.

\large \boxed{\sf y=\dfrac{1}{16}(a-3)^2-2 }

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

4 0
3 years ago
Which of the following expressions are equivalent to -5.1/4.3
jonny [76]

Answer:

1.186

Step-by-step explanation:

3 0
3 years ago
Choose which group of sets the following number belongs to. Be sure to account for ALL sets.
liberstina [14]
Whole numbers, integers, rational numbers, natural numbers, real numbers

All of those are correct
5 0
3 years ago
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