4squared 3, 3/4 is what I got
Answer:
B
Step-by-step explanation:
the mean is calculated as
mean = 
this year's mean =
=
= 4.1
last year's mean =
=
= 3.1
difference = 4.1 - 3.1 = 1
The required expressions are both equations 1 and 2 as shown:

.... 2
Complementary angles are angles that sum up to 90 degrees. For instance, and A and B are complementary if A + B = 90.
According to the question, if two complementary angles have measures of s and t then:

Twice of 's' is expressed as 
If t is less than twice s, this can be expressed as
.... 2
The required expressions are both equations 1 and 2 as shown:

.... 2
Learn more on word problems leading to simultaneous equations here: brainly.com/question/14294864
Answer:

Step-by-step explanation:
The best approximation of the flow rate of the Mississippi River is
.