Answer:
B. He used the wrong expression to represent the area of the base of the pyramid.
Step-by-step explanation:
Given
See attachment for pyramid

Required
Vikram's error
The surface area of a square pyramid is:

Where




So:


By comparing the calculated expression with

Option (b) is correct
It all depends on the importance of the variable its self. Its important to solve it so you know what the variable is and its important to solve one at a time because its impossible to solve a variable completely if you have two of them
Answer:
It's D I got it right
Step-by-step explanation:
I know
B because you have to add 30 to 60
Answer:
2.52
Step-by-step explanation:
An automobile manufacturer claims that its van has a 27.6 miles/gallon (MPG)
So, 
n = 210 vans
x = 28

Formula of test statistic = 


Hence the value of the test statistic is 2.52