We need to multiply Y by 3 since it says "3 times the number".
3Y; next we need to add 4 since it says 4 more.
3y+4; the reason I knew to put it in this order is because it said 4 more than 3 times, which means you add 4 after you multiply.
The expression is 3Y+4
Answer:
x = 30
Step-by-step explanation:
The sum of the 3 interior angles of a triangle = 180°, hence
x + x + 10 + 3x + 20 = 180
5x + 30 = 180 ( subtract 30 from both sides )
5x = 150 ( divide both sides by 5 )
x = 30
So firstly, multiply both sides by 4 (the reciprocal of 1/4): 
Next, subtract both sides by 2 and your answer will be: 
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