Answer:
Sarah is correct
Step-by-step explanation:
Required
Which of the students is correct
Let a number be x,
Given what the teacher asked the students to do, the solution is:



Only Sarah got this correctly; others are incorrect.
The proof is as follows.
For Sarah



So, the numbers will be: 1416, -1416 and 1416
<em>Other students are incorrect</em>
Answer:
Step-by-step explanation:
<u>Order of operations, use the operation within the parenthesis:</u>
<u>Distributive property, a(b + c) = ab + ac:</u>
- 1) 4*5 - 4*2 = 20 - 8
- 2) 20 - 8 = 12
Both ways are correct and lead to same result
Answer: Interval
Step-by-step explanation:
When there is a fixed unit of measure that means arithmetic operations like addition and subtraction can be done on it. So it is interval scale of measurement.
The reciprocal of 7/2 is 2/7
Answer:

Step-by-step explanation:
In the triangle,
Hypotenuse = 13
Opposite = Perpendicular = 5
Adjacent = Base = 12
Now,
Cos B = 
Cos B = 12/13
If the triangle is just like in the attached file!