1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
almond37 [142]
2 years ago
12

An isosceles trapezoid with bottom base 26.5 decimeters, top base 8.5 decimeters, and height 9 decimeters. Find the area. a. 238

.5 dm2 c. 157.5 dm2 b. 257.5 dm2 d. 315 dm2 Please select the best answer from the choices provided A B C
Mathematics
1 answer:
Tamiku [17]2 years ago
6 0

Answer:

I don't understand can you explain it differently?

You might be interested in
The population of the town was 25,000 people.Then 3,200 people moved away.What was the percent of increase?
german

Answer:

-12.8%

Step-by-step explanation:

To calculate the percent decrease, we:

  1. Find the difference between the new value and the original
  2. Divide the number by the original
  3. Multiply by 100 and the % symbol.

The population of the town originally had 25,000. 3,200 people moved away. This means that the new population is 21,800.

  1. 21,800-25,000=-3,200
  2. -3,200/25,000=-0.128
  3. -0.128(100)=-12.8%

The towns population decreased by 12.8%.

6 0
3 years ago
Find the mean and variance of the following data<br><br> 52,34,64,49,55,26,38,63
BlackZzzverrR [31]

Answer:

Mean = 47,625

Variance, ignoring the commas = 157

Explanation:

The mean is quite simple: is the mid value of an amount (m') of numbers.

Examples:

Mean of 2, 4:  2 + 4/2 = 3

Mean of 5, 6 and 8: 1+6+8/3 = 15/3 = 5

Generalizing: M' = An + Bn-1 + Cn-2 +... + Y1/ n

So, for the enunciated, we have:

M = 52 + 34 + 64 + 49 + 55 + 26 + 38 + 63/8

M = 47,625

Variance is quite harder.

The mathematics definition is also quite harder:

∑n, i=1 (Xi - X')²/n

Traduction: the sum of the difference of the square of the dispersion measures by the arithmetic mean of them, divided by the number of observed terms is the square of the standard deviation, that is, the variance.

Don't worry, you don't need to understand that. I'll do the question, then you will see in practice what that means.

First, we need the mean of the observerd terms. We already have done that.

M = 47,625.

Next, we will do the the difference o<em>f the square </em>of the dispersion measures by the arithmetic mean of them. Which are:

A.52 - 47,625 = (4,375)²

B.34 - 47,625 = (-13,625)² - <em>Because of a value like that, you know see why</em>

C.64 - 47,625 = (16,375)²

D.49 - 47,625 = (1,375)²

E.55 - 47,625 = (7,375)²

F.26 - 47,625 = (-21,625)² - <em>we need to square everything: because a negati</em>

G.38 - 47,625 = (-9,625)² - <em>ve result doest not help in the statisc.</em>

K.63 - 47,625 = (15,375)²

I am using a calculator, but really with that, I'll aproximately the values. If you need a accurate measure, just square them all the way.

A = 16     D  = 1     G = 100

B = 169    E = 49    K = 225

C = 256   F = 441

The last part is the sum of the difference of the square of the dispersion measures by the arithmetic mean of them, dividing them by the number of observations.

16 + 169 + 256 + 1 + 49 + 441 + 100 + 225/ 8 = 157,125

8 is the number of observations.

___________________________

But why we do the variance? The variance serves to us for know how much the mean is precise.

So, the lower is the variance, the better is the mean.

Take a look on this example:

Imagine three persons, A, B and C.

They are in pub, talking about how much they receive. A gets, per month, 1000US$, b 2000 and C 3000US$.

So, their mean are 3000US$.

Now imagine that Bill Gates joins the group. And Bill, last month, got 100 milion US$.

Now the mean will be almost 25 milions of dollars.  So, she is VERY far from the reality of the major part of the group. And is in there that cames the variance. Looking to the variance, we will see that there is a big discrepancy for each observed term.

5 0
3 years ago
8/1000 as a decimal? 0.008 did I do that correctly??​
barxatty [35]

Hello! My name is Chris and I’ll be helping you with this problem.

Date: 9/27/20  Time:  9:23 pm CST

Answer:  

0.008

Explanation:

When wanting to get a decimal out of a fraction. Just divide the fraction. Ex. <em>8/1000 = 0.008</em>

I hope this helped answer your question! Have a great rest of your day!

Furthermore,  

Chris

8 0
3 years ago
Read 2 more answers
Help me I don’t get it the problem
Bingel [31]

Step-by-step explanation:

4 9/10 + 3 7/10

49/10 + 37/10(turned into an improper fraction

86/10 ( both figures added )

=8 6/10(result)

6 0
3 years ago
Read 2 more answers
Help is needed please..
MrRissso [65]

Answr 2.(1.3)^x

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • A baby weights 18 pounds at her four month appointment. Six months later she weights 24 pounds. By what percentage did the baby’
    14·1 answer
  • 30 former classmates gathered to celebrate the anniversary of their school graduation. Each of them greeted and shook hands with
    15·2 answers
  • Which equation represents y = x2 + 16x + 70 in vertex form?
    10·1 answer
  • Heyo, please don't ignore! i really need help on these questions
    15·1 answer
  • Line segment ABCD is split into unequal segments by points A, B, C, and D. The length of segment AD is 28 cm, and the distance b
    10·1 answer
  • What is the volume of the rectangle prism?
    12·1 answer
  • X times 10% = 132 what is X
    12·2 answers
  • One question simple please help
    6·1 answer
  • Halpppppp!!!!!!!!
    8·2 answers
  • -4.8=1.2s+2s+4<br><br><br>Please help me <br>​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!