One number is six less than a second number. Twice the first is 4 more than times 6 the second. Find the numbers.

Step-by-step explanation:

We can write the following system of equations:

Let the first number be and the second number be :

Solving, we get:

Solving for :

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answer: d.) the total number of protons and neutrons is 15

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second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.