Answer:
--- Length
--- Width
Step-by-step explanation:
Given
Let: 
Required
Find the dimensions of the rectangle
Area (A) is calculated as:
This gives:
Open bracket
Express as a quadratic function
Expand
Factorize:
This gives:
Width can not be negative.
So:
Recall that:
Answer:
x=2.6
Step-by-step explanation:
(21+39a)/20. Because they have to have the same denominator
Answer:
Option 4: 0.554
Step-by-step explanation:
As we can see that the intervals and their frequencies are given.
We have to calculate the probability of students' score falling between 70 and 89. It will use the frequency of both intervals 70-79 and 80-89.
So, combined scores of both intervals are:
172+105 = 277
Now to find the probability
= 277/500
=0.554
So option no 4 is the correct answer ..
