Answer:
mulltiply
Step-by-step explanation: you mulitply all
 
        
             
        
        
        
The answer is 438.6...
(528+1/5)-(89+3/5)=438.6
        
             
        
        
        
Just measure the width (or height, if you'll be stacking the pennies 
a mile high) of a penny, then divide 5280 feet by whatever you find. 
This is a great activity for a class, and in fact a good way to start 
the project. First take one penny, and work out an answer. Then get 
100 pennies, and measure them; do the same calculation to see how many 
pennies it will take to make a mile. There will probably be a 
difference, because you can measure 100 pennies more accurately than a 
single penny. Or maybe you have a micrometer that will measure one 
penny precisely. Which is better can be a good discussion starter. And 
don't forget to try it in metric, too.
Just to illustrate, using a very rough estimate of a penny's width, 
let's say a penny is about 3/4 inch wide. The number of pennies in a 
mile will be
 5280 ft 12 in 1 penny
 1 mile * ------- * ----- * ------- = 5280 * 12 * 4/3 pennies
 1 mi 1 ft 3/4 in
This gives about 84,480 pennies. (This method of doing calculations 
with units is very helpful, and would be worth teaching.)
If we measure 100 pennies as 6 ft 1 in, we will get
 5280 ft 100 pennies
 1 mile * ------- * ----------- = 5280 * 100 * 12 / 73 pennies
 1 mi 6 1/12 ft
This gives us 86794.5205 pennies in a mile.
        
             
        
        
        
<span>D. the angle of their slope is greater than 40 degrees </span>
        
             
        
        
        
Answer:
Okay so I am assuming you mean the third part?
Step-by-step explanation:
Pretty simple. So you see that the varible x^2 does not have a number in front of it, so there is no extra dividing.
A formula for a perfect square is (x^2)+2xy+y^2
Take 10 and divide it by 2.
10/2=5
You have Y. Finding the third part is squaring Y.
5^2=25
Therefore, the third part of the perfect square is 25. If you want to find Y, look at the stuff above.