Can you please explain the steps to solving this

x=360

Step-By-Step Explanation:

x= a+102 + b+168

since a+b is 90,

x= 90+102+168

x= 360

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Step-by-step explanation:

a+12= 12 added with a

90 = a + b (remeber this)

b+78= 78 added to b

a+120 = a +12+90

b + 168= 90 + b + 168

x= a +120 + b + 168

x= a + b + 120 + 168

x= (a + b) + 288

x= 90 + 288 ( cause we know that a + b = 90)

x = 378

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.