Answer:

Step-by-step explanation:
we have

<em>Find the amount of money that each girl spent</em>
For t= 2 hours



<em>Find the amount of money that they spend together</em>
Multiply by 2 the amount of money that each girl spent

Answer:
y/x = R
Step-by-step explanation:
The two quantities x and y are proportional means they have a relation.
The equation is;
y= Rx ------to find the proportional R you make R the subject of the formula;
y/ x = R
Answer:

Step-by-step explanation:
To find : Convert 110 km/myr (kilometers per million years) to cm/yr (centimeters per year) ?
Solution :
Using metric conversions,
1 kilometer = 1000 meter
1 meter = 100 centimeter
So, 1 kilometer = 100,000 centimeter
and 1 million year = 1,000,000 year


So, 

Therefore, 
<span>It would be 890 but if you estimate it would be this> 900</span>