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3 years ago

3y+6+4y−7=−8 Solve for y

Mathematics

2 answers:

Alexeev081 [22]3 years ago

8 0

The answer is negative one
First, you just collect like terms

Dennis_Churaev [7]3 years ago

6 0

The correct answer for that is y=4

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An airliner carries 150 passengers and has doors with a height of 78 in. Heights of men are normally distributed with a mean of

iogann1982 [59]

Answer:

Step-by-step explanation:

x, height of men is N(69, 2.8)

Sample size n =150

Hence sample std dev = $\frac{2.8}{\sqrt{150} } =0.229$

Hence Z score = $\frac{x-69}{0.229}$

A) Prob that a random man from 150 can fit without bending

= P(X<78) = P(Z<3.214)=1.0000

B) n =75

Sample std dev = $\frac{2.8}{\sqrt{75} } =0.3233$

P(X bar <72) = P(Z<9.28) = 1.00

C) Prob of B is more relevent because average male passengers would be more relevant than a single person

(D) The probability from part (b) is more relevant because it shows the proportion of flights where the mean height of the male passengers will be less than the door height.

3 0

3 years ago

Csc x= -√2 for π≤x≤3π/2

love history [14]

Answer:

Step-by-step explanation:

We can write this as Sinx by "flipping" the $-\sqrt{2}$ .

So we will have: $Sin(x)=-\frac{1}{\sqrt{2} }$

From basic trigonometry, we know the value of $\frac{1}{\sqrt{2}}$ of sine is of the angle $\frac{\pi}{4}$

But when is sine negative? Either in 3rd or 4th quadrant. But the answer has to be between 0 and $\frac{3\pi}{2}$ , so we disregard 4th quadrant.

To get the angle in 3rd quadrant, we add π to the acute angle of the first quadrant (which is π/4 in our case). Thus we have:

$\frac{\pi}{4}+\pi\\=\frac{\pi +4\pi}{4}\\=\frac{5\pi}{4}$

A is the right answer.

7 0

3 years ago

11/5-1/2= Fraction fraction

Luba_88 [7]

Answer:

11/5-1/2 = 22/10-5/10= 17/10 = 1 7/10

Step-by-step explanation:

The answer is 1 7/10

3 0

2 years ago

Read 2 more answers

Hya think of a number "m" . She square it, add "y" to the answer and then subtract 7 from it. The final answer is "A". 1) Derive

Bond [772]

<h2>Solution (1) :</h2>

Given, to find A we have to :

square m
Add y to m²
Subtract 7 from m² + y

From the question, the following equation can be formed :

$=\tt A = {m}^{2} + y - 7$

Therefore, the formula for finding A = m² + y - 7

<h2>Solution (2) :</h2>

The value of A we can derive from the formula is :

$=\tt A = {m}^{2} + y - 7$

Value of m = 3 (given)

Which means :

$=\tt A = {3}^{2} + y - 7$

$=\tt \: A = 9 + y - 7$

$=\tt A = 9 - 7 + y$

$\color{plum} =\tt A = 2 + y$

Thus, the value of A = 2+y

Therefore, the value of A = 2+y

7 0

2 years ago

Round 17,519 to the underlined place value. 17,500 20,000 18,000 17,000

Ira Lisetskai [31]

17500 i think but u didn’t give enough info so it could be any without the extra info

5 0

2 years ago