The answer is 8.5. you simply take the worded equation above and turn it into a math problem (a+-6) x 4
Jim can do the 1/2 of floor in 4 hours
pete completes 1/2 of floor in 2 hour
therefor, since, pete took 1/2 as much time, pete can tile 2 times as many tiles (logic)
pete can lay 25 more than jim
if pete is 2 times of jim
p=2j
and pete is 25 more than jim
p=25+j
2j=p=25+j
2j=25+j
minus j
j=25
jim lays at 25 tiles per hour
C is answer
3x^2- 27 … you divide the whole thing by 3 to get x^2- 9 and that’s the furthest you can simplify
To get the vertex of the parabola we proceed as follows;
y=-7(x-4)^2-5
The above can be written as:
y=-7x^2+56x-117
The values of a,b and c are:
a=-7, b=56 and c=-117
x=-b/(2a)
x=-56/(-7*2)=4
but;
y=-7x^2+56x-117
y=-7(4)^2+56(4)-117
y=-5
Thus;
x=4 and y=-5
The vertex will be at point (4,-5)
