Answer:
35
Step-by-step explanation:
take no. of red footballs be 4x and yellow footballs be 3x
4x=20, x=5
=> 3(5)= 15
total no. of footballs= 20+15= 35
34/3+12/3+2-6+9/6+4+7
Remember PEMDAS:
1. (34/3)+(12/3)+2-6+(9/6)+4+7
11.33+4+2-6+1.66+4+7
The rest can be added together into a calculator (or by hand if you are not supposed to use one)
So it can be easier to solve your problem
Using the Empirical Rule, it is found that the standard deviation of the sample is of:
C. 4
By the <em>Empirical Rule</em>, 95% of the measures are within 2 standard deviations of the mean, that is, between 2 standard deviations below the mean and 2 standard deviations above the mean.
95% of people's heights are <u>between 168 and 184 centimeters</u>, hence, there are 4 standard deviations between 168 and 184 centimeters. Then:
Hence, option C is correct.
A similar problem is given at brainly.com/question/25807482
Answer:
Distribute:
4a^2+4ab+b^2+-2a^2+5ab+3b^2
Combine like terms:
(4a^2+2a^2)+(4ab+5ab)+(b^2+3b^2)
=2a^2+9ab+4b^2