Answer:
<em>Rob has saved </em><em>$24</em><em>.</em>
Step-by-step explanation:
The first thing I noticed was that Rob only saved some of the money he earned. That means only x% only gets saved. To find x, I simply divided 6 by 14 and got 0.42857142857. Then to find the amount he saved from earning $56, I multiplied that number with 56 and got 24.
Most likely in millilitres, kilolitres is too large for a small cup, and the other measurements are for mass
1) A quadratic will have no real roots when its discriminant is negative


Dividing by 4,

We have a positive coefficient on k^2 so this parabola is a CUP (concave up positive) so has a minimum at the vertex. If the vertex y value is less than zero, the inequality will be true in the range between the zeros.

That's true for

2) We look for the meet of the line and the parabola:


For two intersections we need a positive discriminant:



That's means two negative or two positive, so
or 
Six Quarters Is How Many He Needs
2y-3x≤-10
just insert your points into it:
a: 2*2-3*-4<=-10?
4+12<=-10? no
b: 2*3-3*1<=-10?
6-3<=-10? no
c: 2*-4-3*2<=-10?
-8-6<=-10?
yes c is a solution: -14<=-10
d: 2*4-3*4<=-10?
8-12<=-10? no