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
german
2 years ago
12

15$ then we’re marked down to 5$ what is the percent decrease

Mathematics
2 answers:
Juli2301 [7.4K]2 years ago
5 0

Answer:

66% off

Step-by-step explanation:

Temka [501]2 years ago
4 0

Answer:

50% percent is $7.50

80% is 3.00

so it is a bit less then 65% but more then 60%

so it is 66% off

Step-by-step explanation:

You might be interested in
Which expression can be used to find mU?<br> 19.5<br> 7.5<br> vo
Xelga [282]

Answer:

C

Step-by-step explanation:

I know because I know that how

8 0
3 years ago
What is the unknown number? 7 yards 2 ft =___?___ft
german
The missing number is 23 because,
there is 3 feet in 1 yard
so, 7x3=21
21+2=23 
so 7 yards and 2 feet = 23 feet
3 0
3 years ago
Read 2 more answers
Given the function f(x) = 2^x, find the value of f^−1(32).
klio [65]
f(x)= 2^{x}

We are to find the value of f^{-1}(32)

First we need to find the inverse of f(x) . The inverse of 2^{x} is \frac{ln(x)}{ln(2)}.

Steps to find inverse of f(x) are shown below in the image.

So f^{-1}(32) = \frac{ln(32)}{ln(2)}=5

Therefore, the correct answer is option C

5 0
3 years ago
Students who have completed a speed reading course have reading speeds that are normally distributed with a mean of 950 words pe
VikaD [51]

Answer:

36.04% probability that at most two of them would read at less than 850 words per minute

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the binomial probability distribution.

Normal probability distribution

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

Percentage of students who read less than 850 words per minute.

Pvalue of Z when X = 850. The mean is \mu = 950 and the standard deviation is \sigma = 200

Z = \frac{X - \mu}{\sigma}

Z = \frac{850 - 950}{200}

Z = -0.5

Z = -0.5 has a pvalue of 0.3085.

30.85 of students read less than 850 words per minute.

If 10 students are selected at random, what is the probability that at most two of them would read at less than 850 words per minute

This is P(X \leq 2) when n = 10, p = 0.3085. So

P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2)

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{10,0}.(0.3085)^{0}.(0.6915)^{10} = 0.0250

P(X = 1) = C_{10,1}.(0.3085)^{1}.(0.6915)^{9} = 0.1115

P(X = 2) = C_{10,2}.(0.3085)^{2}.(0.6915)^{8} = 0.2239

P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2) = 0.0250 + 0.1115 + 0.2239 = 0.3604

36.04% probability that at most two of them would read at less than 850 words per minute

8 0
3 years ago
What is the value of the discriminant for the quadratic equation 0 = 2x2 + x – 3?
Goshia [24]

The discriminant is D=1^2-4(2)(-3)=1+24=\boxed{25}.

Hope this helps.

4 0
3 years ago
Read 2 more answers
Other questions:
  • Sarah and Bryan went shopping and spend a total of $47.50. Bryan spends $15.50 less than was Sarah spent. How much did Bryan spe
    11·2 answers
  • How do i rewrite an expression with a variable using the distributive property?
    15·1 answer
  • At hill view middle school, 45% of the seventh graders ride the bus to school. If there are 360 seventh graders, how many ride t
    9·1 answer
  • To decrease an amount by 7% what singular multiplier would you use
    11·1 answer
  • Someone please help me on this question!!!!!
    12·1 answer
  • Find x<br><br><br><br><br> Thanks for the help in advance!
    8·1 answer
  • I need help<br> please someone
    13·1 answer
  • Use long division to determine the decimal equivalent of 2/3
    14·1 answer
  • Identify an equation in point-slope form for the line parallel to y = 1x-7 that
    11·1 answer
  • Samantha is studying the population growth of an endangered birth. The growth can be modeled by the equation B(t) 100 + 3/5t^5 ,
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!