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Fofino [41]
3 years ago
5

The product of a number and -3 increased by eight is 20

Mathematics
1 answer:
Assoli18 [71]3 years ago
4 0

Answer:

15

Step-by-step explanation:

20-8 = 12

12- -3 = 15

15 + -3 = 12 + 8 + 20

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Simply<br> (2k-9)^2+(k+2)^2=(2k+1)^2+(k-8)^2
vova2212 [387]

The square of a binomial expands as follows:

(a+b)^2=a^2+2ab+b^2

Expanding all the binomials, we have

4k^2-36k+81+k^2+4k+4=4k^2+4k+1+k^2-16k+64

Sum like terms:

5k^2-32k+85=5k^2-12k+65

Simplify terms appearing on both sides:

-32k+85=-12k+65

Move all terms involving k to the left and all numbers to the right:

-20k=-20

Divide both sides by -20:

k=1

6 0
3 years ago
What mathematical sentence is represented by the diagram?
cricket20 [7]
My only guess is a^2 + b^2 = c^2
7 0
3 years ago
In a group of dog 25% are boys. How many girls are there in the class ?<br><br> Explain
rewona [7]

Answer:

Step-by-step explanation:

identify the known ratio and the unknown ratio.

Set up the proportion.

Cross-multiply and solve.

Check the answer by plugging the result into the unknown ratio.

^^^^^^^^^^^^^^^^^^^^^^^^^^^

is the steps to solve your answer

5 0
3 years ago
Please help me with this. I really don't know how to evaluate it.
Vlad1618 [11]
To do this let's put 129 where X is, like this: -12(129)+14(129)-6(129)

Now we multiply -12 by 129, which is equal to -1548.

Now we multiply 14 by 129, which is equal to 1806.

Now we multiply -6 by 129, which is equal to -774.

Now, let's put these numbers into an equation, like this: -1548+1806-(-774).

The answer to this equation is 1032.

I hope this helps.


5 0
3 years ago
What’s the 10th term of the geometric sequence 3,15,75
mina [271]

Answer:

45 dagree

Step-by-step explanation:

6 0
3 years ago
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