Ok so these are the answers that I can choose~ (Please and thank you <3)
A.44°
B.134°
C.90°
D.34°

Answer:

The probability of completing the exam in one hour or less is 0.0228.

Step-by-step explanation:

Given: Mean = 80

Standard deviation = 10

To find: The probability of completing the exam in one hour or less.

We have, [tex]\mu=80[/tex] and [tex]\sigma=10[/tex].

Now, the z-value is the sample mean decreased by the population mean divided by the standard deviation.

[tex]z=\frac{\bar{x}-\mu}{\sigma}[/tex]

⇒[tex]z=\frac{60-80}{10}[/tex]

⇒[tex]z=-2[/tex]

Now, [tex]z=\frac{\bar{x}-\mu}{\sigma}[/tex]

⇒[tex]z=\frac{75-80}{10}[/tex]

⇒[tex]z=-0.5[/tex]

Again, [tex]z=\frac{\bar{x}-\mu}{\sigma}[/tex]

⇒[tex]z=\frac{90-80}{10}[/tex]

⇒[tex]z=1[/tex]

Using appropriate appendix table, we get [tex]P(z<-2)=0.0228[/tex].

Answer:

A. 0.2033

B. 0.0016

Step-by-step explanation:

Substituting the equation x = 2y + 3 into the equation y=-3x - 4 will produce the equation y = -3(2y + 3) - 4

Linear equations are equations that have constant average rates of change, slope or gradient

A system of linear equations is a collection of at least two linear equations.

In this case, the system of equations is given as

x = 2y + 3

y = -3x - 4

Considering the first equation

x = 2y + 3

Considering the second equation

y = -3x - 4

Substitute the first equation in the second equation

y = -3(2y + 3) - 4

Hence, substituting the equation x = 2y + 3 into the equation y=-3x - 4 will produce the equation y = -3(2y + 3) - 4

Read more about system of linear equations at

https://brainly.com/question/14323743

#SPJ1

Answer:

12.76

Step-by-step explanation:

This is much easier to solve if you draw it out on a graph. The perimeter is the sum of all the sides. I used the Pythagorean theorem to find the hypotenuse.

[tex] {a}^{2} + {b}^{2} = {c}^{2} \\ c = \sqrt{ {a}^{2} + {b}^{2} } [/tex]

[tex]dc = \sqrt{ {3}^{2} + {1}^{2} } = \sqrt{10} \\ cf = 1 \\ fe = \sqrt{ {4}^{2} + {2}^{2} } = \sqrt{20} \\ de = \sqrt{ {1}^{2} + {4}^{2} } = \sqrt{17} \\ \sqrt{10} + 1 + \sqrt{20} + \sqrt{17} = 12.76[/tex]

Answer:

It is halfing each, here is my proof.

Step-by-step explanation:

Half of 0.02 is 0.01 half of that is 0.005 and half of that is 0.0025. This is the cycle, hope it helps! :D

Answer:

y=0.02(5)^x

Step-by-step explanation:

Answer:

(1, 7/2)

Step-by-step explanation:

the formula for midpoint is  [tex](\frac{X1 + X2}{2}[/tex], [tex]\frac{Y1 + Y2}{2})[/tex]

Step-by-step explanation:

The ratio of boys :girls=4:5 so you have 4 boys and 5 girls

Now , you can ,

4/5×350

= 280

280 is the correct answer hope it helps u

Answer:

im sorry but what is the equation. It will have an equation listed below for you to plug in the numbers

Step-by-step explanation:

Answer:

There is no point of the form (-1, y) on the curve where the tangent is horizontal

Step-by-step explanation:

Notice that when x = - 1. then dy/dx becomes:

dy/dx= (y+2) / (2y+1)

therefore, to request that the tangent is horizontal we ask for the y values that make dy/dx equal to ZERO:

0 = ( y + 2) / (2 y + 1)

And we obtain y = -2 as the answer.

But if we try the point (-1, -2) in the original equation, we find that it DOESN'T belong to the curve because it doesn't satisfy the equation as shown below:

(-1)^2 + (-2)^2 - (-1)*(-2) - 5 = 1 + 4 + 2 - 5 = 2  (instead of zero)

Then, we conclude that there is no horizontal tangent to the curve for x = -1.

Answer:

0.51cm/s

Step-by-step explanation:

Area of a circle A = πr²

r is the radius

Rate of change of area is expressed as;

dA/dt = dA/dr • dr/dt

dA/dr = 2πr

radius r = 77cm

dA/dt = 79cm²

Get dr/dt

Substitute the given values into the formula

79 = 2π(77)•dr/dt

79 = 154dr/dt

dr/dt = 79/154

dr/dt = 0.51cm/s

Hence the rate of change of the radius is 0.51cm/s

Answer:

what is the question

Step-by-step explanation:

simplified Answer: 10/3

Non simplified :3 1/3

Step-by-step explanation:

the answer is  b..............

Answer:

'b' option is correct

Step-by-step explanation:

Use the formula of  sin^(Ф) + cos^2(Ф) =1

Answer:

at least two events

Step-by-step explanation:

compound means various.

sooooooooo it would be various!

Answer:

N central and Malzahn St are parrallel while the transversal is Brockway Rd

Step-by-step explanation:

Im not a nerd.

Answer:

B- n is the opposite of 12

Answer:

do 84.32 - 12.4

Step-by-step explanation:

simple as that

Answer: 71.92

Step-by-step explanation:

Here,

a+b=20

ab=50

we know that,

[tex]\tt{ (a+b)^2=a^2+b^2+2ab }[/tex] ⠀

According to the question,

[tex]\tt{(20)^2=a^2+b^2+2×50 }[/tex] ⠀

[tex]\tt{ 400=a^2+b^2+100 }[/tex] ⠀

[tex]\tt{ a^2+b^2=400-100 }[/tex] ⠀

[tex]\tt{a^2+b^2=300 }[/tex] ⠀

Answer:

      a² + b² = 300

Step-by-step explanation:

a + b = 20  ; ab = 50

(a +b)² = a²+ b² + 2ab

a² + b² + 2ab = (a + b)²

a² + b² + 2*50 = (20)²

a² + b² + 100 = 400

         a² + b² = 400 - 100

        a² + b² = 300

Answer:

Step-by-step explanation:

E

This question is incomplete, the complete question is;

Katie Ledecky swims the length of a 50m Olympic size pool in 25 seconds and swims the return trip to the starting position in 26 seconds. What are her average velocities during:

a) The first half of the swim?

b) The second half of the swim?

Answer:

a) her average velocities during the first half = 2 m/s

b) her average velocities during the second half = 1.923 m/s

Step-by-step explanation:

Given that;

displacement = 50 m

time taken t = 25 secs

a)

average velocity = displacement / time taken = 50 / 25 = 2 m/s

Therefore her average velocities during the first half = 2 m/s

b)

In the second half;

displacement = 50 m

time taken t = 26 secs

average velocity = displacement / time taken = 50 / 26 = 1.923 m/s

Therefore her average velocities during the second half = 1.923 m/s

Answer: the percentage of women that are shorter than 68.5 inches is 84.1%

Step-by-step explanation:

Given that;

mean μ = 65

standard deviation σ = 3.5

percentage of women are shorter than 68.5 inches = ?

P( x < 68.5 ) = P(( x-μ)/σ)

we substitute

⇒ ( 68.5-65)/3.5)

⇒ P(z < 1)

form standard normal table

P( x < 68.5 ) = P(z < 1) = 0.84134 ≈ 84.1%

Therefore, the percentage of women that are shorter than 68.5 inches is 84.1%

Answer:

[g+2/3g-1] ÷ [g^2+2g/6g+2]

g+2/3g-1 × 6g+2/g^2+2g

g+2/3g-1 × 2(3g +1)/g(g+2)

1/ 3g-1 × 2(3g+1)/g

2(3g +1)÷ g(3g-1)

6g+2 ÷[3g^2-g]

Answer:

c

Step-by-step explanation:

Answer:

the answers is 1 hour 23 minutes

Step-by-step explanation:

Answer:

y=30

Step-by-step explanation:

Answer:

y=30

Step-by-step explanation:

y=4x-6

y=4(9)-6

y=36-6

y=30

Answer:

What type of math is this?

Step-by-step explanation:

question can u put a picture that looks more clear is blury

Answer:

negative

Step-by-step explanation:

♪＼(*＾▽＾*)／＼(*＾▽＾*)／

Answer:

Step-by-step explanation:

eally expense 22.00 sales tax on 2 jerseys and three pairs of socks and jerseys or cost 6.75 each and the total sales tax was $1.03 in three cents fill in the table with the correct prices