9/20 - 1/4 Add or subtract. Write each sum or difference in simplest form. HELP!

Is this a function or no?

IgorLugansk [536]

Answer:

No

Step-by-step explanation:

Positives cannot point at negatives I think.

5 0

2 years ago

Some of Mrs. Turay’s eighth graders took the PSAT test. Score totals of ten of her students are below. Calculate the mean and th

den301095 [7]

Answer:

(a) Mean=74

(b) Median=70

(c) The best measure of center= Median.

Step-by-step explanation:

We have been given a data set of PSAT scores of Mrs. Turay's eight graders. We are asked to find mean and median of the given data set.

(a) Let us find mean of data set by dividing the sum of given scores by the number of students.

$\text{Mean}=\frac{60+62+67+69+70+70+71+75+76+120}{10}$

$\text{Mean}=\frac{740}{10}=74$

Therefore, the mean test score will be 74.

(b) Now let us find median of our given data set. We have been given that number of students is 10, therefore, our median will be the average of 5th and 6th term.

60, 62, 67, 69, 70, 70, 71, 75, 76, 120.

We can see that 5th term is 70 and 6th term is 70 as well.

$\text{Median}=\frac{70+70}{2}$

$\text{Median}=\frac{140}{2}$

$\text{Median}=70$

Therefore, the median test scores will be 70.

(c) We can see that our data set has an outlier score as 120, which has increased the mean. Mean score is greater than median score. Since median is not affected by extreme value outliers, therefore, median will be the best measure of center for given test scores.

3 0

3 years ago

Read 2 more answers

If you multiply a number by 3 and then subtract 5 you will get 40 what is the number

mart [117]

15 x 3 = 45 - 5 = 40
The number will be 15.
Hope this helped.

4 0

3 years ago

Read 2 more answers

You have 500 ft of fencing all rolled up and you want to make a rectangular playground area for your son. What are the dimension

laiz [17]

When you read this, the first thing that should jump out at you is:
What does "largest" mean ?

Does it mean the longest possible playground ? The widest possible ?
The playground with the most possible area ?

Well, we can narrow it down right away. If you try and find the longest
or the widest possible playground, then what you get is: The longest or
the widest possible playground is 250 feet by zero. It has a perimeter
of 500 ft, and nobody can play in it. That's silly.

It makes a lot more sense if we look for the playground that has
the greatest AREA.

I happen to remember that if you have a certain fixed amount of
fence and you want to use it to enclose the most possible area,
then you should form it into a circle. And if it has to be a rectangle,
then the next most area will be enclosed when you form it into a square.

So you want to take your 500 feet of fence and make a playground
that's 125-ft long and 125-ft wide.

Its area is (125-ft x 125-ft) = 15,625 square feet.

Just to make sure that a square is the right answer, let's test
what we would have if we made it not quite square ... let's say
1 foot longer and 1 foot narrower:

Length = 126 feet
Width = 124 feet

Perimeter = 2 (126 + 124) = 500-ft good

Area = (126-ft x 124-ft) = 15,624 square feet.

Do you see what happened ? We kept the same perimeter, but
as soon as we started to make it not-square, the area started to
decrease.

The square is the rectangle with the most possible area.

5 0

3 years ago

Help please! due today!

miss Akunina [59]

If ,

$\tt{z=-3+5i }$ ⠀