Solve x - 12 = 7 using algebraic operations​

19

Step-by-step explanation:

add 12 to both sides to get x = 19

12 + 12 = 0 since your getting rid of the constants and 12 + 7 = 19 so x = 19

Use the opposite operation in which its formed in

For example 3x = 18

you would have to multiply 3 by x right? So the opposite operation of that is divide by 3 since you dont know the value of x so do the known value which is the number 3 once you divide 18 by 3 you get 6 so put 6 on the right side and keep the equal sign between them to get x = 19.

19

Step-by-step explanation:

I hope this helps!

1) is right

step-by-step explanation:

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:

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