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Artemon [7]
3 years ago
11

Solve and check: -9k+13+k=61

Mathematics
2 answers:
VARVARA [1.3K]3 years ago
8 0
-8k= 48

divide 8

ANSWER: k = -6
olga nikolaevna [1]3 years ago
6 0

\text{Solve for k:}\\\\-9k+13+k=61\\\\\text{Combine like terms:}\\\\-8k+13=61\\\\\text{Subtract 13 from both sides}\\\\-8k=48\\\\\text{Divide both sides by -8}\\\\\boxed{k=-6}

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Will give brainliest, please help fast​
Gekata [30.6K]

Answer:

Converting the equation x^2-20x+13=0 into completing the square method we get: \mathbf{(x-10)^2=87}

Step-by-step explanation:

we are given quadratic equation: x^2-20x+13=0

And we need to convert it into completing the square method.

Completing the square method is of form: a^2-2ab+b^2=(a-b)^2

Looking at the given equation x^2-20x+13=0

We have a = x

then we have middle term 20x that can be written in form of 2ab So, we have a=x and b=? Multiplying 10 with 2 we get 20 so, we can say that b = 20

So, 20x in form of 2ab can be written as:  2(x)(10)

So, we need to add and subtract (10)^2 on both sides

x^2-20x+13=0\\x^2-2(x)(10)+(10)^2-(10)^2+13=0\\(x^2-2(x)(10)+(10)^2) \:can\: be\: written\: as\: (x-10)^2 \\(x-10)^2-100+13=0\\(x-10)^2-87=0\\(x-10)^2=87

So, converting the equation x^2-20x+13=0 into completing the square method we get: \mathbf{(x-10)^2=87}

4 0
3 years ago
These are my last points plzzz i need help with this one. please give a step by step answer
Olegator [25]

Answer:

the price for each doughnut is $1.05

Step-by-step explanation:

doughnuts = d

cookies = c

2d + 3c = $3.30

5d + 2c = $4.95

to find the answer multiply 2 with the first equation, and multiply -3 with the second equation.

4d + 6c = 3.30

-15d - 6c = -14.85

combine like terms

-11d = -11.55

divide by -11

d = 1.05

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3 years ago
Which equation could be used to find the dimensions of the rectangle?
Nikolay [14]
The second answer i believe
7 0
3 years ago
Tom needs to drive 21 miles to work. So far, he has driven 2.2 miles. How many more miles must he drive?
wolverine [178]
Tom needs to drive 18.8 more miles
4 0
3 years ago
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The net of a prism is shown below.
Sliva [168]

Answer:

nothing is there

Step-by-step explanation:

7 0
3 years ago
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