Find the coordinates of the vertex of the following parabola algebraically write your answer as an (x, y) y=-4x^2+8x

x = -2

y = 848

step-by-step explanation:

plug in the numbers

answer: no

step-by-step explanation:

you are only given the cost not the amount of pounds.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

final total: 63

step-by-step explanation:

60 times sales tax

60 times 0.05

3

60 + 3

63