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Answer:

expression for perimeter 3x+12

expresion for area ( 2x+6) ( x+4) /2

P= 29; A = 72

Step-by-step explanation:

Given : hight 2x+6, base length x+4 and triangle is equilateral

perimeter = base + two other sides

because the triangle is equilateral the base length is the same as the other two sides

perimeter = x+4 + x+4 +x+4 = 3x + 12

area = base *hight / 2 = (x+4) ( 2x+6) /2  

if x=5

P = 3*5 +12 = 29, A = (5+4) ( 2*5+6)/2 = 9* 16/2 = 144/2 = 72

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