Answer:
1 mile = 0.5 cm
Step-by-step explanation:
I hope this helps!
First of all, move all terms to the same side:

You can factor an x, which means that
is a solution:

This expression is further factorizable if the quadratic equation has any solution. Using the quadratic formula, we can find that they are
So, we have

Assuming you made an error typing the question out, and the formula should say 30g, as it's $30 a round:

Answer:
the first one: y=2x ²-1
Step-by-step explanation:
Plug in the "x" to the equation, so: 2(2) ²-1 = 7 which is "y" in the table above.
Density = mass/volume
Volume = length x width x height
Volume = 2.5 x 2.5 x 2.5
= 15.625 cm^3
Density = 295/15.625
= 18.88 g/cm^3