ANSWER
1.39
EXPLANATION
The given quadratic equation is

This is the same as,

Comparing to

We have
a=2, b=3,c=-8
Using the quadratic formula, the solution is given by:

We substitute the values to get,


The positive root is

to the nearest hundredth.
The 90% confidence interval is (70 - 4, 70 + 4). The margin of error is 4%.
14.2% = 0.142
hope it helps☺☺
Answer:
The question is lacking the detail of the price of the ice cream cones.
Assuming the ice cream cones cost $2 each then she would have to sell;
= 250/2
= 125 ice cream cones
<em>If she sells 125 ice cream cones, she will be able to raise $250 if the cones are sold at $2 each. </em>