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3 years ago

I need help please and thank you!

Mathematics

1 answer:

ziro4ka [17]3 years ago

8 0

Answer:

v is 198 m/s

Step-by-step explanation:

$v = \sqrt{gh} \\ v = \sqrt{9.8 \times 4000} \\ v = 198 \: m {s}^{ - 1}$

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Alex and Josh rode bikes. Alex rode 15 miles in 55 minutes. Josh rode 77 minutes at a faster rate per mile than Alex. Find Alex'

Helga [31]

Answer:

a) $x = \frac{11}{3}\,\frac{min}{mi}$ , b) $y = \frac{77}{15}\,\frac{min}{mi}$

Step-by-step explanation:

a) The indicator is equal to the ratio of total time to travelled distance:

Alex

$x = \frac{55\,min}{15\,mi}$

$x = \frac{11}{3}\,\frac{min}{mi}$

b) In the case of Josh, the ratio must be greater than x. Then:

$y = \frac{77\,min}{15\,mi}$

$y = \frac{77}{15}\,\frac{min}{mi}$

8 0

4 years ago

Which of these is equivalent to p=2l+2w

vlabodo [156]

Im pretty sure the answer is p /2 - w =1 if this isnt the answer you can try a math site that explains all the rules to the problem

3 0

3 years ago

Simplify the expression.

gogolik [260]

Answer:

7y² - y + 21

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Distributive Property

Algebra I

Terms/Coefficients

Step-by-step explanation:

Step 1: Define

4y - y(3 - 7y) + 5 + 2(8 - y)

Step 2: Simplify

[Distributive Property] Distribute parenthesis: 4y - 3y + 7y² + 5 + 16 - 2y
Combine like terms (y): 7y² - y + 5 + 16
Combine like terms: 7y² - y + 21

5 0

3 years ago

Suppose the scores, x, on a college entrance exam are normally distributed with a mean of 500 and a standard deviation of 100. T

Volgvan

Answer:

The minimum score an applicant must receive for admission is 392.

Step-by-step explanation:

Let the minimum score required be 'x₀'.

Given:

Mean score (μ) = 500

Standard deviation (σ) = 100

Percentage required for admission, P > 86% or 0.86

So, we are given the area under the normal distribution curve to the right of z-score which is 86%.

The z-score table gives the area left of the z-score value. So, we will find the z-score value for area 100 - 86 = 14% or 0.14

So, for value equal to 0.1401, the z-score = -1.08

Now, $P(x>x_0)=P(z>-1.08)$

So, we find x₀ using the formula of z-score which is given as:

$z=\frac{x_0-\mu}{\sigma}\\\\-1.08=\frac{x_0-500}{100}\\\\x_0-500=-1.08\times 100\\\\x_0=-108+500=392$

Therefore, the minimum score an applicant must receive for admission is 392.

7 0

3 years ago

Marcus spends $58 at the bookstore. He spends the same amount of money on each of the 4 books he purchase. He also paid $4 in sa

Marat540 [252]

Answer:

$15.5

Step-by-step explanation:

58+4=62 62divided by4=15.5 :) Have a nice day

8 0

3 years ago

I need help please and thank you!​

I need help please and thank you!