Answer:
21
Step-by-step explanation:
15 - 11 +17
plug in calculator
or 15-11 = 4
and
4 +17 = 21
<span>The fundamental idea of
multiplying is <em>repeated addition</em>. For example:

By taking the number five and add it itself three times we have:
In contrast, let's take the number
three and add it itself five times, so:

.
Both 3 and 5 are called
factors that are numbers. We can multiply them to get another number. Multiplying can also be expressed like this:

So you have the factors:
You can even write any multiplication as the
product of factors. On the other hands, factoring shows that you can write any nth-degree polynomial as the product of linear factors, so:

To conclude the <em>relationship</em> between both concepts is the
product of factors.</span>
Answer:
57
Step-by-step explanation:
a. let us say that:
a = cost of phones with camera
b = cost of phones with camera and mp3
c = cost of phones without any features
b = 2 a – 35
c = a – 100
a + b + c = 525
b > a > c
b. We are given three equations with three unknowns. So
we can solve the problem.
a + (2 a – 35) + (a – 100) = 525
a + 2 a – 35 + a – 100 = 525
4 a – 135 = 525
4 a = 660
a = $165