C=3 that’s the answer I think
I hope this helps you
4.4-7,8
16-7,8
8,2
Explanation is in the photo
Yes it is.
F1 = k q1 * q2 / r^2
F2 = k *(2*q1) * (4.8 q2) / (7.2 r^2)
Work on F2 for a moment.
F2 = k * 9.6 (q1*q2) / 51.84
F2 = (9.6/ 51.84) * k * q1 * q2 / r^2
Since k * q1 * q2/r^2 is the same in both questions let kq1*q2/r^2 = m
F1 = m
F2 = 0.18 m
So to make it easier F2/F1 = 0.18m / m
F2/ F1 = 0.18 the m's cancel.
And that should be how you do the question.
Option b: 7000
Explanation:
The function that Larissa earns on an investment is

The amount of money originally invested by Larissa can be found using the compound interest formula,

where
P is the amount of money invested. (Principal)
r is the rate of interest which can be expressed as decimals.
x is the number of periods.
Hence, comparing
with the formula
, the principal amount can be determined.
Thus, the principal amount is 7000.