Answer:
The required equation is ![D=0.5(4)](https://tex.z-dn.net/?f=D%3D0.5%284%29)
Step-by-step explanation:
Consider the provided information.
Student on the cross-country team runs 30 minutes a day as a part of her training,
30 minutes = 0.5 hours
As we know ![Speed=\frac{Distance}{Time}](https://tex.z-dn.net/?f=Speed%3D%5Cfrac%7BDistance%7D%7BTime%7D)
Let the distance she runs in miles, is represented by D, and her running speed, in miles per hour is represented by S.
Therefore, the required equation is: ![S=\frac{D}{0.5}](https://tex.z-dn.net/?f=S%3D%5Cfrac%7BD%7D%7B0.5%7D)
Part (A) At a constant speed of 4 miles per hour for the entire 30 minutes.
Substitute S=4 in above equation.
![4=\frac{D}{0.5}](https://tex.z-dn.net/?f=4%3D%5Cfrac%7BD%7D%7B0.5%7D)
![D=0.5(4)](https://tex.z-dn.net/?f=D%3D0.5%284%29)
![D=2](https://tex.z-dn.net/?f=D%3D2)
Hence, the required equation is ![D=0.5(4)](https://tex.z-dn.net/?f=D%3D0.5%284%29)
Answer: She has 21 lira coins.
Step-by-step explanation:
Given, Laura collects old foreign coins. She has 83 coins in total. She has 53 lira and drachma coins. She has 51 lira and peseta coins.
Let x = the number of lira coins.
y= the number of drachma coins.
z= the number of peseta coins.
Then, as per given, we have
x+y+z=83 (i)
x+y=53 (ii)
x+z=51 (iii)
From (ii) and (iii)
y=53-x
z=51-x
Put these values in (i) , we get
x+(53-x)+(51-x)=83
⇒ x+53-x+51-x=83
⇒ 104-x=83
⇒104-83=x
⇒x= 21
Hence, she has 21 lira coins.
Answer:
72
Step-by-step explanation:
68 69 71 71 71 73 74 75 75 78 and then cross off each number until you reach the middle. You will see 71 and 73 next to each other, what's in-between those two numbers? 72!
3.78 liters in one gallon.