Answer:
C
Step-by-step explanation:
This method is the best because it will survey the customers under one condition : every 10. If the store gets a lot of customers, then this should be easier to do. The rest are mostly dependent on what they do and that influences the survey. However, C makes it so that every 10 people are surveyed.
Answer:
The balloons new height is
Step-by-step explanation:
Let
x ----> the number of minutes
y ----> the height of a hot air balloon in feet
we know that
The linear equation in slope intercept form is equal to
where
m is the slope or unit rate
b is the y-intercept or initial value
In this problem we have
The slope is equal to
---> is negative because is a decreasing function
The y-intercept is equal to
substitute
For x=9 minutes
substitute in the linear equation
When the bases are the same you add the exponents
-5+3 ==-2
7^-2 or. 1/49
A^2+b^2=c^2
Change the equation to suit the problem
c^2-a^2=x^2
5^2-4^2=x^2
25-16=x^2
9=x^2
Square root
3=x
The value of x is 3