Answer:
320 in
Step-by-step explanation:
85% is 0.85 decimals
85 percent of 30
30 * 0.85 = 25.50
30-25.50 = 4.50
Solution: after sale, it is $4.50
1) the vertex of a parable is given for two points, ( -b/2a, -b2-4ac/4a)
2) Now substitute the values in the equation
x = - (-8)/2(-2) = 8/ -4 = -2
y = -(8^2-4(-2)(1)/ 4(-2) = -(64-8) /-8 = 56/8 = 7
v(-2,7)
okay so, first what is the slope of the line? you have stated it is -1.
so now we have a point on the line (x1,y1) = (4, -9), so now we can use:
y-y1 = m(x-x1)
y - (-9) = -1 (x - 4)
y + 9 = -x + 4
y = -x + 4 -9
y = -x -5
Let's check. If x = 4, then
y = - (4) -5 = -9
seems to be correct
