The number of stars in the milky way galaxy have an approximate it to be between 200 billion and 400 billion write these numbers in scientific notation

2 x 10^11 and 4 x 10^11

Step-by-step explanation:

We use scientific notation because it makes it easy to calculate things on very large and very small scales.

1 billion = 10^9

So 200 billion = 200 x 10^9

But we want that starting number to be between 1 and 10.

200 x 10^9 = 2 x 100 x 10^9 = 2 x 10^2 x 10^9 = 2 x 10^11

400 billion has the same number of zeros as 200 billion sooo

400 billion = 4 x 10^11

Step-by-step explanation:

Given

Force = 0.052 N when Distance = 1.6 m

Required

Find Force; when distance = 0.74 N

The question says force is inversely proportional to square of distance;

Let F represent Force and D represent Distance;

Mathematically;

Convert proportion to equation

Where k is the proportionality constant; This means that k is always constant

Make k the subject of formula

When F = 0.052 and D = 1.6; the value of k is as follows

When F = 0.74;

Recall that k is always constant; so

To solve for D, we'll make use of

Substitute and F = 0.74;

Multiply both sides by D²

Divide both sides by 0.74

Take square roots of both sides

(Approximated)