The sum of three numbers is 131. the second of three numbers is seven more than twice the first. the third number is 12 less than the first. what equation can be used to solve the problem? x + x + x = 131 x + (x + 7) + (x – 12) = 131 x + (2x + 7) + (x – 12) = 131 x + (2x + 7) – 12 = 131

For value of x

x + (2x + 7) + (x - 12 ) = 131

For y

y = 2x + 7

For z

z = x -12

Step-by-step explanation:

Let three numbers be

x , y and z

Now according to first condition

x + y +z = 131 (i)

According to other condition

The second number i.e. y is 7 more then twice of first

which will be

y = 2x + 7             (ii)

According to last condition

3rd number i.e. z is 12 less then first which is

z = x - 12                (iii)

As we have got The value of y and z from equation (ii) and (iii) respectively we can find the value of x by substituting these values in equation (i)

Now substituting values of x and y in equation (i) gives us

x + (2x + 7) + (x - 12 ) = 131

From this equation we can find the value of x and which could be substituted to the equation (ii) to find the value of y and for value of z we can substitute it to equation (iii)

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

the correct answer would be:

220 centimeters

to get this you can use the pythagorean theorem

hope this

step-by-step explanation: