Mathematics College

(c) 80 people entered the marathon. 85% of
finished in under three hours. How many
people finished in under three hours?

Answers

Answer 1

Answer:

68 people

Step-by-step explanation:

Find how many finished in under 3 hours by multiplying 80 by 0.85

80(0.85)

= 68

So, 68 people finished in under 3 hours

Related Questions

An isotope of the element seaborgium has a half-life is 30 seconds. How much would there be left after one minute if we started with 4 pounds? Show all your work.

Answers

Answer:

Step-by-step explanation:

Which of the following conversions is correct?

A. 1 cup is equivalent to 2 pints.
B. 4 pints is equivalent to 1 quart.
C. 1 gallon is equivalent to 128 fluid ounces.
D. 1 quart is equivalent to 8 cups.

Answers

1 gallon = 128 ounces

Answer:

C. 1 gallon is equivalent to 128 fluid ounces.

Step-by-step explanation:

Factor this trinomial completely.
15x2 + 11x - 12
A. (x + 4)(15x - 3)
B. (3x + 3)(5x – 4)
C. (x+3)(15x - 4)
O D. (3x + 4)(5x – 3)

Answers

Answer:

D

Step-by-step explanation:

3x * 5x = 15x^2

3x * -3 = -9x

4*5x = 20x

4 *-3 = 12

so 15x^2 +(20x -9x) -12 or 15x^2 +11x -12

he National Center for Health Statistics interviewed 5409 adult smokers in 2015, and 2666 of them said they had tried to quit smoking during the past year. Consider this to be a random sample. Find a 95% confidence interval for the proportion of smokers who have tried to quit within the past year. (Round the final answers to three decimal places.) The 95% confidence interval is ( , ).

Answers

Answer:

95% confidence interval for the proportion of smokers who have tried to quit within the past year

(0.47956 ,0.50620)

Step-by-step explanation:

Step(i):-

Given that  National Center for Health Statistics interviewed 5409 adult smokers in 2015

Sample size 'n' = 5409

Given that 2666 of them said they had tried to quit smoking during the past year.

proportion

             [tex]P = \frac{x}{n} = \frac{2666}{5409} = 0.49288[/tex]

             Q = 1 - P = 1 - 0.49288 = 0.50712

Step(ii):-

95% confidence interval for the proportion of smokers who have tried to quit within the past year

[tex]({P - Z_{0.05} \sqrt{\frac{PQ}{n} } , P + Z_{0.05} \sqrt{\frac{PQ}{n} )[/tex]

[tex]({0.49288 - 1.96 \sqrt{\frac{0.49288 X 0.50712}{5409} } , 0.49288 + 1.96\sqrt{\frac{0.49288 X 0.50712}{5409} )[/tex]

(0.49288 - 0.01332 , 0.49288+0.01332)

(0.47956 , 0.50620 )

Final answer:-

95% confidence interval for the proportion of smokers who have tried to quit within the past year

(0.47956 ,0.50620)

The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution. 1271 1187 1194 1250 1268 1316 1275 1317 1275 (a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s. (Round your answers to the nearest whole number.)

Answers

Answer:

The sample mean year is 1261 A.D.

The standard standard deviation is of 46 A.D.

Step-by-step explanation:

Sample mean:

Sum of all values divided by the number of values. So

[tex]x = \frac{1271+1187+1194+1250+1268+1316+1275+1317+1275}{9} = 1261.4[/tex]

Rounding to the nearest whole number, the sample mean year is 1261 A.D.

Sample standard deviation:

Square root of the sum of the difference squared between each value and the mean, divided by one less than the sample size. So

[tex]s = \sqrt{\frac{(1271-1261.4)^2+(1187-1261.4)^2+(1194-1261.4)^2+(1250-1261.4)^2+(1268-1261.4)^2+(1316-1261.4)^2+(1275-1261.4)^2+(1317-1261.4)^2+(1275-1261.4)^2}{8}} = 45.8[/tex]

Rounding to the nearest whole number, the standard standard deviation year is of 46 A.D.

Help please ASAP I have to have this done In the hour

Answers

Answer:

A. 1,2,3,4

B. 1,2,3

C. 5 and up

D. $30

Step-by-step explanation:

Please answer or give the steps to answer please please please this is my state test and i can’t fail

Answers

Answer:

1. 466.3ft

2. 12.1m

Step-by-step explanation:

1.

Imagine this as a triangle like shown in pic attached, then use tan to find 'x', the distance between the base of the tower and the fire:

tanA=opposite/adjacent

tan25=x/1000

x=100tan25

x=466.3ft

2.

Imagine this as a triangle like shown in pic attached, then use sine to find 'x', the kite's vertical height above the boy's hand:

sinA=opposite/hypotenuse

sin12=x/50

x=50sin12

x=10.4m

The kite's height off the ground is this plus the height of the boy's hand from the ground: 10.4+1.7=12.1m

if a 4.0 cm X 5.5 cm photo is enlarged so that is length is 8.5 what s the new width?

Answers

Answer:

6

Step-by-step explanation:

PLEASE HELP ASAP!!!!!!!

Answers

Answer:

the wrong one is the last one

Step-by-step explanation:

because 9 times 40 doesnt = 350 it equals 360

The last one is wrong

The x-intercepts of a quadratic
(also called the zeros) occur
when the y-coordinate is [?].

Answers

Answer:

0

Step-by-step explanation:

The x-intercepts of a quadratic

(also called the zeros) occur

when the y-coordinate is [0].

That is why the x-intercepts are called zeros.

Answer:

0

Step-by-step explanation:

The x-intercepts of a quadratic

(also called the zeros) occur

when the y-coordinate is 0.


Please help!!
Find the coordinates of the vertex of the following parabola algebraically. Write your
answer as an (x, y) point.
y = 4x + 56x + 192

Answers

Answer:

 The vertex of the parabola   = (-7 , -4)  

Step-by-step explanation:

Step(i):-

Given that the parabola  y = 4 x² + 56 x +192

                                 y = 4 (x² + 14 x + 48 )

                                 y = 4 ( x² + 2 ×  7 (x) + 49-1)

                                 y = 4 ( x² + 2 ×  7 (x) + 49)- 4

we apply the formula

(a +b)² = a² + 2ab + b²

                                y = 4 ( x + 7 )² - 4

Step(ii):-

The general form of the parabola in algebraically

                              y = a ( x-h)² +k

The equation

                          y = 4 ( x + 7 )² - 4

                          y = 4 ( x-(-7))² - 4

  The vertex of the parabola (h,k) = (-7 , -4)  

Final answer:-

The vertex of the parabola  = (-7 , -4)  

|x-3|= - 2 1/4 Math question

Answers

Answer:

No solution

Step-by-step explanation:

Absolute value can not output a negative result

Find the measure of <5.
45 = [?]
699
45
Enter

Answers

Answer:

Step-by-step explanation:

Answer:

Solution given:

<5+69°=180°[co- interior angle]

<5=180°-69°=111°

<5=111°

On the number line, plot and label all numbers with an absolute value of 32. Where did you place the points?

Answers

Answer:

on 32 and -32

Step-by-step explanation:

a=5 (the fifth try) The amount of time Chip took to run through the maze on the 5th try can be modeled by t = 0.5a2 - 9a + 48.5 where t = time in seconds. Variable a=5, and then calculate the time t. Compare your time to others. Is it higher or lower? Why?​

Answers

Answer:

lower

Step-by-step explanation:

What is the missing length?
10 km
2
area = 33 km

Answers

Areas are measured in km2, not in km.

One number is equal to the square of another. Find the numbers if both are positive and their sum is 306.​

Answers

Answer: 17 or -18

Step-by-step explanation:

x^2+x=306

x^2+x-306=0

(x-17)(x+18)=0

x-17=0

x=17

x+18=0

x=-18

..i think this is the right answer

VI.
Molly paid $85 last month for her utilities. 55% of this amount was for electricity
a. How much did Molly pay for electricity?
What percentage of her money did she have left over?
c. What is the amount of leftover money Molly has for last month?

Answers

Answer:

$46.75

0.55 X 85 = $46.75

Kim and Steven went to dinner. Kim had a coupon for a 25% discount off the price of all meals, not including tax and tip, if the original price of meals was $75.00, what is the discounted price, not including tax and tip?

Answers

Answer:

The discounted price, not including tax and tip is $56.25.

PLEASE HELP ME ASAPPPPPPPPPPPPPPPPPPPPP

Answers

Jug=gallons
Box=cubic feet

Good luck!

Mr.Rosenthal wants to make gumbo a type of soup he buys some shrimp for $7.95 an onion for 0.26 and a bunch of celery for $1.03 how much dose he spend on the ingredients

Answers

Answer:

$9.24

Step-by-step explanation:

7.95+1.03+.26 = 9.24

answer: 9:24$


explainatiom

Write the slope-intercept form of the equation for the line passing through the given pair of points. (-9, 0) and (6, 4)
explain please show work

Answers

Hope you understand :)

63°
13°
Choose the equation that best describes the image

Answers

Answer:

63degrees

Step-by-step explanation:

I cant see the picture well but i assume that is an angle and it is right before 90 degrees

Which term could be put into the blank to create a fully simplified polynomial written in standard form

Answers

Answer:

[tex]x^{2} y^{2}[/tex]

Step-by-step explanation:

The correct term that could be put into the blank would be the first choice which is x to the power of two and y to the power of two.

What is the starting term of 64?​

Answers

Answer:

1

Step-by-step explanation:

One is the starting term

1, 2, 4, 8, 16, 32, 64, 128, 256,

giving brainliest *easy*!!

Answers

Answer:

452.16 square yards

Step-by-step explanation:

The equation for the SA of a sphere is A=4πr2

Substituting r = 6 yards : A= 4 * 3.14 * 6^2 = 452.16 square yards

Answer:

452.16

Step-by-step explanation:

Bradley's bike has an odometer, which shows how far he rides. Bradley rode 2.7 miles on
Monday, 2.4 miles on Tuesday, and 2.8 miles on Wednesday.
How many days did Bradley ride more than 2 miles?

Answers

Answer:

7.9

Step-by-step explanation:

I added 2.7 + 2.4 + 2.8, lmk if it's wrong.

Can someone help me :(

Answers

Answer:

27/64

Step-by-step explanation:

(3/4)^3 = 27/64


Does anyone know?????

Answers

Answer:

The answer is B

Step-by-step explanation:

The reason for this is that for every hour, the person earns another $7.25. In 2 hours, this is $14.50, and at the 2 hour mark, only chart B is at that y-coordinate.

PLEASE HELP!!!!!Find the equation of each line and then put each equation into the form Ax+By=C where A,B, and C are integers

through(-3,2) and parallel to the line joining (2,3) and (1,-2)​

Answers

Answer:

y-5x-7=0

Step-by-step explanation:

m = -2-3/1-2

m=5

y-y1 = m(x-x1)

y-2=5(x+3)

y-2=5x +5

y-5x-7=0

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