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Eva8 [605]
3 years ago
7

Helpp! how do i do this

Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
8 0
The answer for this question is -1
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13 is 5% of what number?
AlekseyPX
The answer to your question is 260
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3 years ago
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Solve for (a+1)/2=1/a.
LenKa [72]

Hello!

To solve this, you are trying to convert one side to a quadratic equation and the other to just 0. Then, solve the equation.

----

First, move the /2 to the other side of the equation.

(a+1)/2 = 1/a

a+1 = 2/a

Next, multiply both sides by a.

a+1 = 2/a

a^{2} +a=2

And then subtract both sides by 2. This will get you to a quadratic equation.

a^{2} +a=2

a^{2} +a-2=0

Now, factor the equation. When we're factoring, we are looking for the form (a + b)(a + c), where b + c must equal 1 (the coefficient of a) and b*c must equal -2. In this case, b = 2, and c = -1.

Therefore:

a^{2} +a-2=0

(a + 2)(a - 1) = 0

To get the answer, recall that anything multiplied by 0 is equal to 0. Therefore, to get the left side to equal 0, either (a + 2) or (a - 1) must equal 0. To do this, a must either be -2 or 1.

Therefore, a = -2, or a = 1.

----

Check your work:

(-2 + 1)/2 = 1/-2

-1/2 = -1/2

(1 + 1)/2 = 1/1

2/2 = 1/1

1 = 1

----

Hope this helps!

6 0
3 years ago
How do u subtract (3x+5y-4)_(4×+11)
AleksAgata [21]
Distribute the negative sign to the 4x and 11 making it 3x+5y-4-4x-11 and combine like terms 
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4 years ago
Solve 9= 1 + 8x - 8.
insens350 [35]
9 = 1 + 8x - 8

Add 8 to both sides:
17 = 1 + 8x

Minus 1 on both sides:
16 = 8x

Divide both sides by 8
2 = x

Hope it helped :)
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3 years ago
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How you express the average of five quizzes is 85 in mathematical expression​
zvonat [6]
Let x1, x2, x3, x4, x5 be the scores for the five tests respectively and y be the average score of those tests.

y = (x1 + x2 + x3 + x4 + x5) / 5

since y = 85:

(x1 + x2 + x3 + x4 + x5) / 5 = 85
4 0
3 years ago
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