For this case we have the following numbers:
 299
 388
 Let's round up each of the numbers to the nearest hundred,
 We have then:
 299 = 300
 388 = 400
 We note that now we have two numbers whose approximation is easier to add.
 We have then:
 300 + 400 = 700
 Answer:
 The sum of 299 + 388 is approximately:
 700
 
        
                    
             
        
        
        
a + b = 88 <span>
<span>
</span><span>ab = y 
</span><span>
</span><span>a = 88 - b 
</span><span>
</span><span>y = (88 - b)*b 
</span>
<span>y = -b^2 + 88b 
</span><span>
</span><span>Take the derivative and set equal to 0 
</span><span>
</span><span>y' = -2b + 88 = 0 
</span><span>
</span><span>2b = 88 
</span>
<span>b = 44 </span></span>
<span><span>a=44</span></span>
<span><span> both numbers are 44</span></span>
 
        
             
        
        
        
Answer:
20 minutes 
Step-by-step explanation:
To make one round of the field, Lisa will have to cover the entire perimeter of the field. 
The perimeter of a rectangle = 2(l+w) Where L = length and W = width. 
The multiplication of 2 means two lengths and widths that each rectangle has. The perimeter of the field = 2(150 +50) = 400m
Lisa's average running speed = 100m/min
The time taken to cover one round of the field or one perimeter of the field = 400/100 = 4 minutes. 
To cover 5 rounds or 5 perimeters Lisa will take 5x4 minutes = 20 minutes. 
 
        
                    
             
        
        
        
Answer:
As a percent, that is 88%.
Step-by-step explanation: