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2 years ago

Somebody please help me !!!!

Mathematics

1 answer:

Stells [14]2 years ago

7 0

Answer:

First use this formula= V=4/3πr^3

r=radius

Step-by-step explanation:

answer: 2144.66 I think. I might be wrong. Please let me know if I'm wrong.

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This is a linear equation/ graph quiz ! please help , my teacher makes no sense to me!

JulijaS [17]

Answer:

(8,5)

Step-by-step explanation:

5x - 2y = 30

coordinates are (x,y) so you plug in 8 for x and solve for y

5(8) - 2y = 30

40 - 2y = 30

subtract 40 from both sides to isolate y

-2y = -10

divide both sides by -2 to isolate y

y = 5

6 0

3 years ago

Read 2 more answers

Audrey makes a certain shade of blue paint. She uses 3 1/2 quarts of blue paint with 5 quarts of white paint. Her cousin Evan wi

Lesechka [4]

Answer:

b = 0.7w

Step-by-step explanation:

To make a shade of blue paint :

3 1/2 quarts of blue

5 quarts of white

3 1/2 α 5

7/2 = 5k

Where k is the proportionality constant

k = 7/2 ÷ 5

k = 7/2 * 1/5

k = 7/10

k = 0.7

To mix :

b quartz of blue with w quartz of white

b = kw

b = 0.7w

3 0

3 years ago

The time needed to complete a final examination in a particular college course is normallydistributed with a mean of 80 minutes

Artist 52 [7]

Answer:

a) 0.023

b) 0.286

c) 10 students will be unable to complete the exam inthe allotted time.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 80 minutes

Standard Deviation, σ = 10 minutes

We are given that the distribution of time to complete an exam is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(completing the exam in one hour or less)

P(x < 60)

$P( x < 60) = P( z < \displaystyle\frac{60 - 80}{10}) = P(z < -2)$

Calculation the value from standard normal z table, we have,

$P(x < 60) =0.023= 2.3\%$

b) P(complete the exam in more than 60 minutes but less than 75 minutes)

$P(60 \leq x \leq 75) = P(\displaystyle\frac{60 - 80}{10} \leq z \leq \displaystyle\frac{75-80}{10}) = P(-2 \leq z \leq -0.5)\\\\= P(z \leq -0.5) - P(z < -2)\\= 0.309- 0.023 = 0.286= 28.6\%$

c) P(completing the exam in more than 90 minutes)

P(x > 90)

$P( x > 90) = P( z > \displaystyle\frac{90 -80}{10}) = P(z > 1)$

$= 1 - P(z \leq 1)$

Calculation the value from standard normal z table, we have,

$P(x > 90) = 1 - 0.8413 = 0.1587 = 15.87\%$

15.87% of children of class will require more than 90 minutes to complete the test.

Number of children =

$\dfrac{15.87}{100}\times 60 = 9.52\approx 10$

Approximately, 10 students of class will require more than 90 minutes to complete the test.

4 0

3 years ago

Free points and brainlyst spill sum t

aliya0001 [1]

Answer:

yay :D

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Brads statement shows a previous balance of $2592.35 a payment of 75$ and new transactions totaling $432 . His APR is 18.6% . Wh

zubka84 [21]

Answer:

Option A - 2988.37

Step-by-step explanation:

Given : Brads statement shows a previous balance of $2592.35 a payment of 75$ and new transactions totaling $432 . His APR is 18.6% .

To find : What is his new balance?

Solution :

Previous balance = $2592.35

Payments = $75

First we find the unpaid balance,

Unpaid balance = Previous balance - Payments

= $2592.35 - $75

Unpaid balance = $2517.35

Rate of interest= 18.6%=0.186

Now, we find the finance charge

Finance charge = Finance rate × Unpaid balance

Finance charge = $\frac{0.186}{12}\times 2517.35=39.018925$

Finance charge = $39.02

New balance = Unpaid balance + finance charge + new transaction

New balance = $2517.35 +$39.02+ $432

New balance =$2988.37

Therefore, Option A is correct.

7 0

3 years ago