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3 years ago

Number 10 !! I NEED HELP THANKYOU

Mathematics

1 answer:

Lunna [17]3 years ago

7 0

You have to get from $30 to $21.75
21.75/30=0.725 x 100= 72.5% of the original price

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PLEASE HELP I WILL GIVE BRAINLIEST TO THE FIRST PERSON TO ANSWER

jekas [21]

Answer:

1. 2x = 60

x = 30

y = x - 5 = 30 - 5 = 25

2. x= 11

4 0

3 years ago

At a certain time of day 1.8m tall person standing next to the Washington monument cast a 0.7m shadow at the same time the Washi

mezya [45]

Answer:

169 m

Step-by-step explanation:

See the image below.

Line AB represents the monument and line BC its shadow

Line DB represents the man and Line BE it shadow.

The Sun’s rays are parallel, so AC||DE.

Then ∆ABC ~ ∆DBE

AB:BC::DB:BE

x/65.8 = 1.8/0.7 Multiply both sides by 65.8

x = 65.6 × 1.8/0.7

x = 65.6 × 2.571

x = 169 m

The height of the Washington monument is 169 m.

8 0

3 years ago

The amount of Jen’s monthly phone bill is normally

vredina [299]

Answer:

$P(19$

And we can find this probability with this difference and using the normal standard distribution

$P(-3$

Step-by-step explanation:

Let X the random variable that represent the amount of Jen monthly phone of a population, and for this case we know the distribution for X is given by:

$X \sim N(55,12)$

Where $\mu=55$ and $\sigma=12$

We are interested on this probability

$P(19$

And we can use the z score formula given by:

$z=\frac{x-\mu}{\sigma}$

Replacing the info we got:

$P(19$

And we can find this probability with this difference and using the normal standard distribution

$P(-3$

7 0

3 years ago

Please help me with math please and explain if u explain i will give brainlist also thanks

sasho [114]

Answer:

number 1. is C and number 2. is A

5 0

2 years ago

Read 2 more answers

Applicants who wish to be admitted to a certain professional school in a large university are required to take a screening test

Elden [556K]

Answer:

Probability of eligible applicants who pass the exam is 0.665

probability of applicants who are ineligible but pass the exam 0.063

Step-by-step explanation:

Total percentage eligible applicants who pass the exam

$\textrm {89\% of 70\%}= \dfrac{89\times70}{100}=62.3\%$

Total ineligible applicants who pass the exam

$\textrm {14\% of 30\%}= \dfrac{14\times30}{100}=4.2\%$

All applicants who pass this exam 62.3% + 4.2% = 66.5%

Probability of applicants who pass the exam

$\textrm{probability }= \dfrac{66.5}{100}=0.665$

Out of 66.5% applicants who pass the exam , 4.2% applicants are ineligible

$\textrm{so the probability is}\dfrac{4.2}{66.5}=0.063$

Probability of applicants who pass the exam is 0.665

probability of applicants who are ineligible but pass the exam 0.063

6 0

3 years ago