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<span>By the time firework a has been launched, firework b has already been launched for 0.25 seconds, so if we treat the two as equations, then
a = 220 (t)
b =</span> 220 (t) + 220 (.25)
<span>And we want to know when these two equal eachother, as that's they will both detonate.
220t = 200 t + 200 (.25)
20t = 50
t = 2.5</span>
Answer:
Step-by-step explanation:
We can break the composite figure into two triangles and two trapezoids. The area of a triangle is given by 
and the area of a trapezoid is given by 
(average of the bases multiplied by the height).
Area of first triangle (larger triangle to the figure's left): 
Area of second triangle (smaller triangle to the figure's right ): 
Area of first trapezoid (smaller trapezoid directly underneath second triangle and adjacent to both triangles): 
Area of first triangle (larger triangle to the figure's left): 
Thus, the area of the entire figure is:
Answer:correction so 1] y = 3x + 7
// Plug this in for variable y in equation [2]
[2] 5x + 2•(3x+7) = 3
[2] 11x = -11
// Solve equation [2] for the variable x
[2] 11x = - 11
[2] x = - 1
// By now we know this much :
x = -1
y = 3x+7
// Use the x value to solve for y
y = 3(-1)+7 = 4
Step-by-step explanation:
