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bulgar [2K]
2 years ago
7

Just need help here pls

Mathematics
1 answer:
julia-pushkina [17]2 years ago
7 0

Answer:

k=6, k=-1

Step-by-step explanation:

                         \dfrac{k+3}{3}-\dfrac{2}{k-5}=1

\implies \dfrac{(k+3)(k-5)}{3(k-5)}-\dfrac{3 \cdot 2}{3(k-5)}=1

\implies \dfrac{k^2-2k-15-6}{3(k-5)}=1

\implies k^2-2k-21=3k-15

\implies k^2-5k-6=0

\implies (k-6)(k+1)=0

\implies k=6, k=-1

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I need help on this problem please help me.
a_sh-v [17]

Answer:

150 mL

Step-by-step explanation:

Let x represent the quantity of 75% solution needed. The total amount of alcohol in the 60% mixture will be ...

75%·x + 10%·45 = 60%·(x+45) . . . . . there will be x+45 mL of solution in the end

0.15x = 22.5 . . . . . . . . . . . . . . . . . . . . simplify, subtract .60x+4.5

22.5/0.15 = x = 150 . . . . . . . . . . . . . . mL of 75% solution needed

You will need 150 mL of the 75% solution.

3 0
3 years ago
What is the area of a circle that has a diameter of 16in
rjkz [21]

Answer:

A=πr2

A=π8^2

A=π* 8* 8

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Step-by-step explanation:

8 0
2 years ago
How do you show the work ? help
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5 0
3 years ago
The measure of an angle is 2.8.what is the measure of its complementary angle
german

Answer:

87.2º

Step-by-step explanation:

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3 0
3 years ago
Read 2 more answers
an isosceles triangle contains two equal angles. Each of these angles is 25 degrees larger than twice the smallest angle. What a
Helga [31]
Well, the sum of all internal angles in a triangle, isosceles or whatever else, is always 180°, so the sum of all those three folks, will be 180 then

so.. hmmm let's say the smallest angle is "a" units

twice that is, 2*a, or 2a
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so... the other two twin angles, are 2a+25 each

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5 0
3 years ago
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