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3 years ago

Help ME! I’m literly struggling

Mathematics

1 answer:

miv72 [106K]3 years ago

6 0

Answer:

See explanation below

Step-by-step explanation:

BD - diagonal Added Construction

m∠CBD = m∠ADB Alternate Interior Angles Theorem

BD ≅ DB Reflexive Property

m∠A = m∠C Opposite ∠'s Congruent Theorem

ΔABD ≅ ΔCDB AAS or SAS

BC ≅ DA CPCTC

AC - diagonal Added Construction

m∠BCA = m∠CAD Alternate Interior Angles Theorem

AC ≅ CA Reflexive Property

m∠B = m∠D Opposite ∠'s Congruent Theorem

ΔABC ≅ ΔCDA AAS or SAS

AB ≅ CD CPCTC

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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

expeople1 [14]

Answer:

The probability that a randomly selected boy in secondary school can run the mile in less than 302 seconds is 0.0107

Step-by-step explanation:

Consider the provided information.

It is given that mean is 440 seconds and standard deviation is 60 seconds.

z factor for less than 302 seconds would be: $z=\frac{x-\mu}{\sigma}$

z = (302 - 440) / 60 = -2.3

The probability of getting a z factor of less than -2.3 = 0.0107 approximately.

looking up in the z-table for a z factor of -2.3.

The probability of a student running the mile in less then 302 seconds would be 0.0107.

Hence, the probability that a randomly selected boy in secondary school can run the mile in less than 302 seconds is 0.0107

7 0

3 years ago

Mabel measured an angle on her math worksheet with her protractor. The angle measured 163°. If she were to draw an angle which w

STatiana [176]

Two supplementary angles equal 180 degrees when added together.

180 - 163 = 17

the other angle would be 17 degrees

8 0

2 years ago

I need help with this practice problem It’s from my trig prep guide

Zinaida [17]

We know that π = 180°, therefore:

$2\pi=2(180)=360$

Answer: correct

$\frac{5\pi}{6}=\frac{5(180)}{6}=\frac{900}{6}=150$

Answer: no correct

$\frac{\pi}{6}=\frac{180}{6}=30$

Answer: no correct

$\frac{5\pi}{4}=\frac{5(180)}{4}=\frac{900}{4}=225$

Answer: correct

$\frac{4\pi}{3}=\frac{4(180)}{3}=\frac{720}{3}=240$

Answer: correct

6 0

1 year ago

30/10 as a whole number

mrs_skeptik [129]

3.

30 divided by 10 equals 3

7 0

4 years ago

2 hours after a freight train leaves delhi a passenger train leaves the same station traveling in the same direction at an avera

insens350 [35]

The average speed of the freight train was 10.67 km/hr.

<h3>What is average speed?</h3>

The average speed is the total distance traveled by the object in a particular time interval.

Now it is given that,

Average speed of the passenger train = 16 km/hr

Time taken by passenger train to overtake the freight train = 4 hours

So, the distance between two trains = Average speed of the passenger train * Time taken by passenger train overtake the freight train

⇒ distance between two trains = 16 * 4 = 64 km

Thus, Distance to be covered by freight train = 64 km

Since, freight train leaves the same station in the same direction after 2 hours.

Hence, total time taken to cover 64 km by freight train = 2 + 4

= 6 hours

⇒ Average speed of the freight train = Distance covered by freight train/total time taken to cover 64 km

⇒ Average speed of the freight train = 64/6 km/hr

⇒ Average speed of the freight train = 32/3 km/hr

or, Average speed of the freight train = 10.67 km/hr

Thus, the average speed of the freight train was 10.67 km/hr.

To learn more about average speed:

brainly.com/question/14556289

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5 0

1 year ago