Answer:
$4500
Step-by-step explanation:
$350 x 10 = 3500 + 1000 which ends up with a total of $4500. I hope this helped :)
To determine the answer of Part A draw the equilateral triangle and the to determine the coordinates of of the third charge use that triangle.
To calculate the gravitational field strength in part B from each of the charges use the following equation.
E=kcq/r2
If you would add those values then you can use the symmetry about the y axis to make the vector addition a litter easier.<span />
Answer:

Step-by-step explanation:
y is equal to 2 and goes up to infinity
10/25 = 2/5 Because you divide both sides by 5