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3 years ago

HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics

2 answers:

Oliga [24]3 years ago

8 0

Answer:

C 1,844

Step-by-step explanation:

Debora [2.8K]3 years ago

8 0

C, this can be done with an approximate

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A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys

jek_recluse [69]

Answer:

The boys need to complete the run in 385.9 seconds or less in order to earn a certificate of recognition from the fitness association.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 450

Standard Deviation, σ = 50

We are given that the distribution of time for fitness test is a bell shaped distribution that is a normal distribution.

Formula:

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

We have to find the value of x such that the probability is 0.10

P(X<x) = 0.10

$P( X < x) = P( z < \displaystyle\frac{x - 450}{50})= 0.10$

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

$P(z\leq -1.282) = 0.10$

$\displaystyle\frac{x - 450}{50} = -1.282\\\\x = 385.9$

Hence, boys need to complete the run in 385.9 seconds or less in order to earn a certificate of recognition from the fitness association.

8 0

4 years ago

Identify the maximum value of the function y = −4x2 − 24x + −36.

kenny6666 [7]

$y = -4x^2 - 24x + -36$

$y = -4(x^2 + 6x) -36$

$y = -4(x^2 + 6x + (6/2)^2) + 4(3)^2 -36$

$y = -4(x + 3)^2$

We clearly get the maximum at x=-3, in which case y=0

Answer: 0, last choice

5 0

3 years ago

Each can of tennis balls has $x$ balls. Initially, Sam has 14 cans of tennis balls, plus 3 extra balls. Jerri initially has 7 ca

shepuryov [24]

Answer:

13balls

Step-by-step explanation:

2(7x+8)-14x+3=? distribute

14x+16-14x+3 do like terms

14x-14x cancel

16-3 =13

it may seem confusing in the explanation but i hope that helps.

4 0

3 years ago

Acellus inverse variation

RUDIKE [14]

The current when the resistance is 10 ohms is 24 amps

<h3>What are variations?</h3>

Variations are simply data that change in values (i.e. not constant)

<h3>Types of variation</h3>

The types of variations are:

Direct variation
Inverse variation
Joint variation
Combine variation

From the complete question (see attachment), we have the following highlights

The variation is an inverse variation
When current (I) is 30 amps, the resistance (R) is 8 ohms

An inverse variation is represented as:

$k = IR$

Where k represents the constant of variation.

The above equation can be rewritten as:

$I_1R_1 = I_2R_2$

So, we have:

$30 \times 8 = I_2R_2$

$240 = I_2R_2$

When the resistance is 10 ohms, we have:

$240 = I_2 \times 10$

Divide both sides by 10

$24 = I_2$

Rewrite the above equation as:

$I_2 = 24$

Hence, the current when the resistance is 10 ohms is 24 amps

Read more about inverse variation at:

brainly.com/question/1327394

8 0

3 years ago

in her kayak bunny can travel 70 miles downstream with the current in 5 hours. the return trip against the current takes 7 hours

Alinara [238K]

9514 1404 393

Answer:

kayak: 12 mph
current: 2 mph

Step-by-step explanation:

Bunny's rate downstream is ...

(70 mi)/(5 h) = 14 mi/h = k + c

Bunny's rate upstream is ...

(70 mi)/(7 h) = 10 mi/h = k -c

The kayak speed is the average of these:

(14 mi/h +10 mi/h)/2 = ((k +c) +(k -c))/2

(24 mi/h)/2 = 2k/2

12 mi/h = k

Then the current speed is ...

c = k -10 = 12 -10 = 2 . . . . mi/h

The still-water speed of the kayak is 12 mi/h; the speed of the current is 2 mi/h.

_____

<em>Additional comment</em>

World-class kayak paddlers will not maintain a speed more than 8 mi/h for that distance and/or time (140 miles in 12 hours). Bunny is exceptional.

4 0

3 years ago