Maximum of function

where

you can find by using this formula:

In height function you've got:
a= -16
b= 200
c= 4
Just substitute! You'll get

Maximum height is 629 [units]
Complete Question
An F5 tornado is classified as having mean wind speeds greater than 261 mph. In an effort to classify a recent tornado, 20 wind speed measurements were randomly selected from within the path of the tornado. Suppose the mean wind speed for this tornado really is greater than 261 mph with a sample standard Deviation 41.09 mph. Based on the data, if we fined little to no evidence against the null hypothesis that the mean wind speed is 261 mph, we have made _______________.
Answer:

Step-by-step explanation:
From the question we are told that:
Sample size 
Population mean
Sample mean
Sample standard deviation
Generally the equation t test statistics is mathematically given by



Therefore
Pvalue from table is

He took home $160 after donating 20% (which is $40)
Answer:
See explanation
Step-by-step explanation:
A
x + 3y = 5
(x, y) = (2,1)
x + 3y = 5
2 + 3(1) = 5
2 + 3 = 5
5 = 5
The equation is true
B.
y = –x + 3
(x, y) = (2, 1)
y = –x + 3
1 = -2 + 3
1 = 1
The equation is true