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2 years ago

Helppppppppppppppppppppppp

Mathematics

1 answer:

harina [27]2 years ago

8 0

(-5, 12). Cosecant is the reciprocal of sine. Since csc theta =13/12, sin theta=12/13. We can narrow down to two angles, one in first quadrant and one in second quadrant. We are also given sec theta=-13/5, so cos theta=-5/13. Thus the angle is in the second quadrant. tan theta=1/cot theta=-12/5, so point (-5, 12) is on the ray.

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The data list shows the scores of ten students in Mr. Smith's math class. 61, 67, 81, 83, 87, 88, 89, 90, 98, 100 What is the st

anzhelika [568]

Sample standard deviation

Mean of data = 84.4

Calculate deviations from the mean = 23.4, 17.8, 3.4, 1.4, -2.6, -3.6, -4.6, -5.6, -13.6 and -15.6

Squaring these deviations; we get 547.56, 316.84, 11.56, 1.96, 6.76, 12.96, 21.15, 31.36, 184.96, 243.36

Adding these we get 1378.47

As its a sample Std Dev we divide by 10 - 1 = 9. For the popklation Std Dev we divide by the number of scores (10).

Std Deviation for sample = sqrt ( 1378.47 / 9) = 12.4 to nearest tenth (answer)

Population Std Dev = sqrt (1378.47 / 10) = 11.7 answer

Theres a lot of arithmetic there so hope i haven't slipped up anywhere!

6 0

2 years ago

Solve the system of equations using substitution method x=y+2 x+2y=5 PLEASE HELP!!

nlexa [21]

Answer:

x=1

y=-1

Step-by-step explanation:

x = y+2

x+2y = 5

y+2 +2y = 5

3y +2 = 5

3y = 3

y=1

x=-1

6 0

3 years ago

Read 2 more answers

a) The radius of a circular field is 42 m. Find the perimeter of the field. Also find the length of wire required to fence it wi

rewona [7]

263.89

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5 0

3 years ago

Read 2 more answers

Solve for n. 0= 1+n

maks197457 [2]

Answer:

n = -1

Step-by-step explanation:

To make n on its own, you have to subtract 1 from both sides

0 - 1 = -1 + 1 + n

-1 + 1 = 0

-1 = n

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3 years ago

A stack of cards is numbered 1 through 50 if a student selects a card what is the probability that the student will select a car

maw [93]

Answer:

The probability that the student will select a card that has both the same number in the ones place in the tens place is 0.08

Step-by-step explanation:

To solve this exercise we have to know that the probability is calculated by dividing the number of favorable events by the number of possible events.

f = favorable events

we will count how many numbers between 1 and 50 have the same number in the ones place in the tens place

11 ; 22 ; 33 ; 44

as we can see there are 4 numbers

f = 4

p = possible events

the number of possible events is given by the number of cards in the deck

p = 50

4/50 = 0.08

The probability that the student will select a card that has both the same number in the ones place in the tens place is 0.08

7 0

2 years ago