**Answer:**

time taken=1800 seconds

**Step-by-step explanation:**

velocity=v=10m/s

distance=S=18km=18×10³m=18000m

t=?

as we know that

velocity=

velocity×time taken=distance covered

now here we have to find time

time taken=

time taken=

time taken=1800seconds

**Answer:**

(f- g)(x) = x - 3

**Step-by-step explanation:**

(f- g)(x) = f(x) - g(x)

This means that you have to subtract the two equation.

If f(x) = 3x - 2 and g(x) = 2x + 1

Then

f(x) - g(x) = [3x - 2] - [2x+1]

= 3x - 2- 2x - 1

= x - 3

∴ (f- g)(x) = x - 3

The given** rock** is a **diamond** because its density ranges among 3.5 and 3.54 g/cm³.

<h3>What is density?</h3>

Density is the mass of a specific material per unit volume. Density is commonly measured in grams per cubic centimetre. Water, for example, has a density of 1 gram per cubic centimetre, whereas **Earth** has a density of 5.51 grams per cubic centimetre.

- Density is also measured in kilograms per cubic metre (or metre-kilogram-second or SI units).
- Air has a density of 1.2 kilograms per cubic metre. Textbooks and handbooks list the densities of popular solids, liquids, and gases.
- Density provides an easy way to calculate a
** body's mass** from its volume and vice versa; a mass is proportional to the quantity multiplied by density (M = Vd), or the volume is equal to mass divided by the density. (V = M/d).

The formula for density is;

D = M/V,

where,

D is density,

M is mass ( = 1.17 g)

V is volume (0.33 cm³)

Substituting the values in the **density** formula;

Density = 1.17/0.33

Density = 3.54 g/cm³

As**, diamond** has a density that ranges between 3.5 & 3.54 g/cm3. As a result, the above rock is indeed a diamond.

To know more about the **density,** here

**brainly.com/question/6838128**

**#SPJ4**

The correct question is-

If a rock sample has a mass of 1.17 g and a volume of 0.33 cm3, what type of rock is it?

**Answer:**

The average occupancy rate for the past three nights is of 86.49%.

**Step-by-step explanation:**

We want to find the average occupancy rate, as a percentage.

**You've sold 101 rooms, 98 rooms, and 102 rooms over the past 3 days.**

So the mean number of rooms sold during the past 3 days is given by:

**Average rate:**

The average occupancy rate for the past three nights is of 86.49%.