Answer/Step-by-step explanation:
Area of trapezium = ½*(AD + BC)*AB
Area = 42 cm²
AD = (x + 8) cm
BC = (x + 5) cm
AB = x cm
Plug in the values into the equation
42 = ½((x + 8) + (x + 5))*x
42 = ½((x + 8 + x + 5)*x
42 = ½(2x + 13)*x
Multiply both sides by 2
42*2 = (2x + 13)*x
84 = 2x² + 13x
2x² + 13x = 84
Subtract both sides by 84
2x² + 13x - 84 = 0
Using I = PRT
$2500 - $2000 = $2000 × 0.04 × t
$500 = 80t
t = $500 ÷ 80
t = 6.25 years
so the answer is 6
The soda is price elastic because if you sell 10 dollars ecah you have an revenue of 20 dollars. And if you shorten the price to 1 dollar and you sell 30 of them you have a revenue of 30 dollars.
So the sodas are price elastic.
