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
harina [27]
2 years ago
7

Erika calculated that she would spend $115 on school supplies this year. She actually spent $82.50 on school supplies. What is E

rika’s percent of error?
a 28.3%
b 2.8%
c 39.4%
d 32.5%
Mathematics
2 answers:
Sophie [7]2 years ago
7 0

Answer:

The answer is actually C

Step-by-step explanation:

This is because you do 115 - 82.50 = 32.5 then divide by 82.5 = 0.394 multiply by 100 = 39.4%. A lot of people use the theoretical number to divide instead of the actual, because people confuse the number 115 the theoretical number with the actual one. This causes people to use the number 115 to divide when you should use 82.5 to divide.

DerKrebs [107]2 years ago
6 0
The equation to find percent error is:
percent error=(experimental-theoretical)/theoretical *100
So, (115-82.5)/82.5=0.393939*100
39.3939%, or 39.94%

Hope this helps!!
You might be interested in
If x = -5, which inequality is true?
stealth61 [152]

Answer:

A

Step-by-step explanation:

Its A because -4 - 3x > 7 because -1 - 7 is -6 but u have to - 1 because of the negative signs

8 0
2 years ago
When the solution to x2 − 11x + 5 is expressed as 11 plus or minus the square root of r, all over 2, what is the value of r? x e
soldi70 [24.7K]

Answer:

C = 101

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Triangle ABC has AB=5, BC=7, and AC=9. D is on AC with BD=5. Find the length of DC
e-lub [12.9K]

Answer:

DC=\frac{8}{3}\ units

Step-by-step explanation:

The picture of the question in the attached figure

we know that

The triangle ABD is an isosceles triangle

because

AB=BD

The segment BM is a perpendicular bisector segment AD

so

<em>In the right triangle ABM</em>

Applying the Pythagorean Theorem

BM^2=AB^2-AM^2

we have

AB=5\ units\\AM=x\ units

substitute

BM^2=5^2-x^2

BM^2=25-x^2 -----> equation A

<em>In the right triangle BMC</em>

Applying the Pythagorean Theorem

BM^2=BC^2-MC^2

we have

BC=7\ units\\MC=AC-AM=(9-x)\ units

substitute

BM^2=7^2-(9-x)^2

BM^2=49-(81-18x+x^2)  

BM^2=49-81+18x-x^2

BM^2=-x^2+18x-32 ----> equation B

equate equation A and equation B

-x^2+18x-32=25-x^2

solve for x

18x=25+32\\18x=57\\\\x=\frac{57}{18}

Simplify

x=\frac{19}{6}

<em>Find the length of DC</em>

DC=AC-2x

substitute the given values

DC=9-2(\frac{19}{6})

DC=9-\frac{19}{3}\\\\DC=\frac{8}{3}\ units

8 0
3 years ago
A parent died and left an estate to four children. One inherited 1/2 of the estate, the second inherited 1/8, And the third inhe
cluponka [151]
The fourth child inherits 2/8
7 0
3 years ago
The temperature was 14`°F`. If the temperature dropped 5 degrees every hour for 4 hours, what is the temperature after the 4 hou
Nina [5.8K]

Answer:

-6F

Step-by-step explanation: It would be 5F(4hr) = 20F. So if you have 14F subtract 20F you get -6F. Hope this helped.

4 0
2 years ago
Other questions:
  • You're making cookies for a party. 1 of every 20 cookies falls apart. if you make 40 cookies how many will fall apart?
    13·2 answers
  • Gianna has a certain number of rings, r. Melissa has 6 times as many rings as Gianna. What expression can be used to represent t
    15·1 answer
  • Which of the following functions is graphed below
    13·1 answer
  • What is 23 3/8 as a decimal
    11·2 answers
  • Marisa painted 1/2 of her bedroom in 3/4 of an hour. At this rate, how long would it take her to paint the entire room?
    6·1 answer
  • Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.
    12·1 answer
  • Conjectures can always be proven true.<br> True or False
    8·2 answers
  • Which determines this shape?
    9·1 answer
  • A cake has circumference of 2517 25 1 7 inches. What is the area of the cake? Use 227 22 7 for π π . Round to the nearest hundre
    14·1 answer
  • The ideal gas law states that the volume, v, of a gas in liters varies directly with the amount of the gas in moles, n, and the
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!