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
kirza4 [7]
2 years ago
5

Sarah got a 80% on her pre algebra final exam. if there were 75 questions total how many did sarah get correc? How many did she

get wrong? what percent did she get wrong?
HELP PLS
Mathematics
2 answers:
stepladder [879]2 years ago
8 0
She got 60 correct and 15 wrong. She got 11.25% wrong
NNADVOKAT [17]2 years ago
6 0

Answer: Sarah got 60 questions correct, 15 questions wrong, and she got 20% of the questions wrong.

Step-by-step explanation:

First, let's solve for how many questions Sarah got correct.

80% as a fraction can be simplified as \frac{8}{10}. To find how many questions Sarah answered correctly, we can set up a proprtional relationship as follows:

\frac{8}{10}=\frac{?}{75}

Next, after we cross multiply, 8 X 75 = 600, and 600 ÷ 10 = 60

So, Sarah got 60 out of 75 questions correct.

To find how many she missed, we can simply subtract 60 from 75 to get 15.

So, Sarah got 15 out of 75 questions wrong.

Finally, to find the percentage of the questions that Sarah got wrong, we can use the 15 out of 75 incorrect questions that we found earlier to create a percentage.

15 ÷ 75 = 0.2

0.2 X 100 = 20

So, Sarah got 20% of the questions wrong.

You might be interested in
If f x = 7x<br><br> 2 − 4x − 10, then f −3 =?
Schach [20]

Answer:

f(x)=xy3 -4xy2 -7x+10

Step-by-step explanation:

the xy3 and xy2 means x to the 3rd power and x to the second power

7 0
3 years ago
According to a study, an average of six cell phone thefts is reported in San Francisco per day. Assume that the number of report
lions [1.4K]

Answer:0.29

Step-by-step explanation:

An average of six cell phone thefts is reported in San Francisco per day. This means our mean value, u = 6

For poisson distribution,

P(x=r) = (e^-u×u^r)/r!

probability that four cell phones will be reported stolen tomorrow=

P(x=4)= (e^-6×6^4)/4!

= (0.00248×1296)/4×3×2×1

= 3.21408/24=

0.13392

P(x=5)= (e^-6×6^5)/5!

= (0.00248×7776)/5×4×3×2×1

= 19.28448/120

= 0.1607

probability that four or five cell phones will be reported stolen tomorrow

= P(x=4) + P(x=5)

= 0.13392 + 0.1607

= 0.294624

Approximately 0.29

8 0
2 years ago
You make $443 per week, and have claimed five exemptions. How much money will be withheld from you in a year? For weekly gross i
disa [49]

Answer:

Choice A. $2,392 is the correct answer :)

Step-by-step explanation:

3 0
3 years ago
Use the properties of logarithms to expand the following expression as much as possible. simplify any numerical expressions that
FinnZ [79.3K]
\bf log_{{  a}}(xy)\implies log_{{  a}}(x)+log_{{  a}}(y)&#10;\\ \quad \\\\&#10;% Logarithm of rationals&#10;log_{{  a}}\left(  \frac{x}{y}\right)\implies log_{{  a}}(x)-log_{{  a}}(y)&#10;\\ \quad \\\\&#10;% Logarithm of exponentials&#10;log_{{  a}}\left( x^{{  b}} \right)\implies {{  b}}\cdot  log_{{  a}}(x)\\\\&#10;-----------------------------\\\\&#10;ln\left( \cfrac{6x^9}{y^5} \right)\implies ln(6x^9)-ln(y^5)\implies ln(6)+ln(x^9)-ln(y^5)&#10;\\\\\\&#10;ln(6)+9ln(x)-5ln(y)
8 0
3 years ago
Which expressions are equivalent to k/2?
AURORKA [14]

Answer:

C

Step-by-step explanation:

think of a random K number (like 3 for example)

1/2(3) = 3/2

this equals k/2 = 3/2

6 0
2 years ago
Other questions:
  • Just want to check to make sure this is right. I got 81 as the average so D seemed right.
    6·1 answer
  • The table below summarizes the number of children per household for a sample of 29 families
    7·1 answer
  • Three cans of Additive are regularly priced at 5 for $2.95. If you buy them at a special sale, you get a factory rebate of $1. W
    7·1 answer
  • I don't know how to answer number 9 and 10. Can someone please help me?
    8·1 answer
  • What is the opposite?
    14·2 answers
  • Solve this system by substitution (3 variables) brainliest answer goes to first answer and 8 points!
    5·1 answer
  • The standard diameter of a golf ball is 42.67 mm. A golf ball factory does quality control on the balls it manufactures. Golf ba
    11·1 answer
  • What is the slope of the equation 2x+3y=10?
    10·2 answers
  • Which of these is a correct identity?<br> x + 4x = 5x<br> 6x = 18<br> 2x + 1 = 7<br> 7x + 9 = x
    8·1 answer
  • a survey of patients at the hospital classified the patients by gender and blood type as seen in the two-way table refer to the
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!