The topics you should learn are equating denominators and fractions. This is summing up simple fractions.
So we have to make denominators' numbers the same in order to sum up them all (we can sum fractions if the denominators are the same) , and we did it by cross product (that thing on the picture)
Equating by lcm (least common multiple) is the easiest way, because you might see bigger numbers on other questions, and cross product will bring much bigger numbers, so this technic might confuse you.
By the way lcm of 4 and 5 is already 20
Hope it helps!
Step-by-step explanation:
A trinomial is an expression that has three terms.
Square trinomial
A square trinomial is simply a perfect square trinomial, and it is represented as:
\mathbf{a^2 + 2ab + b^2 = (a + b)^2}a2+2ab+b2=(a+b)2
Difference of square binomials
This is easily identified because, the terms of the square binomials are perfect squares.
The difference of square binomials is represented as:
\mathbf{a^2 - b^2 = (a + b)(a - b)}a2−b2=(a+b)(a−b)
Sums and difference of cubes
When cubes are added or subtracted, they can be expressed using the following
\mathbf{a^3 + b^3 = (a + b)(a^2 - ab + b^2)}a3+b3=(a+b)(a2−ab+b2) --- sum of cubes
\mathbf{a^3 - b^3 = (a - b)(a^2 + ab + b^2)}a3−b3=(a−b)(a2+ab+b2) --- difference of cubes
Read more about binomial and trinomial at:
brainly.com/question/12289266
Answer:
5a^4b^6c
Step-by-step explanation:
15a^6b^8c / 3a^2b^2
=5a^4b^6c
Y-8 I’m pretty sure I hope it’s correct!
Answer: (39.424, 61.576)
Step-by-step explanation:
When population standard deviation(
) unknown ,The confidence interval for population mean is given by :-
, where n= Sample size
= sample mean.
s= sample standard deviation
= Critical t-value (two-tailed)
Given : n= 15
Degree of freedom= 14 [df=n-1]
Significance level = 
For 
and df = 14, the critical t-values : 
Then the 95% confidence interval for population mean will be :
Hence, a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall. : (39.424, 61.576)
