Answer:

Step-by-step explanation:

GIVEN THAT,

LET'S SOLVE NOW

Hope this helps
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Answer:
9.043478261
Step-by-step explanation:
I hope this helps!
Okay so the area of a rectangle x by y with a border of width b will be:
A=(x+2b)(y+2b)
A=xy+2bx+2by+4b^2 we are told that A=320, x=11, and y=15 so now we have:
320=165+22x+30x+4x^2, now I am using x as the border width...
4x^2+55x+165=320 is the equation that they listed..
...
4x^2+55x-155=0 using the quadratic formula for efficiency...
x=(-55±√5505)/8 since x>0
x≈2.399 which for some unknown (incorrect) reason they rounded to
x=2.5
So in short, your answer is a)
Given:
The inequality is

To find:
The solution for the given inequality in both set and interval notations.
Solution:
We have,

It can be written as



Multiply both sides by -8 and change the inequality sign.

It means all the values of
which are less than or equal to
are included in the solution set.
Set notation is
.
Interval notation is
.