8 = 8v - 4 (v + 8)
Distribute the 4 through the parentheses
8 = 8v - 4v - 32
combine like terms
8 = 4v - 32
add 32 to both sides
8 + 32 = 4v -32 + 32
combine like terms
40 = 4v
divide each side by 4
40/10 = v
4 = v
v= 4
1. 5,000 times 1.09 times 5 = 2,693
2. 5,000 - 6,500= 1500 ÷4 = 3.3%
Yes, this is a parabola; it is a u-shaped graph.
The vertex is at (5, 120), and each corresponding point on either side of the graph is the same distance from the vertex.
Vicky’s average speed is 0.55m/h