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2 years ago

20 points! I need help! I will also be doing a 50 point giveaway later!

Mathematics

2 answers:

Aloiza [94]2 years ago

3 0

Answer:

5. There were 30 students in that class.

6. Drew weighed 245 pounds at the start.

Step-by-step explanation:

5. Since 3 students are absent in which represents 10% of the classroom, multiply the number 3 by 10 to get 30 students which represents the full roster.

6. 20% of his original weight is 49, multiply that number by 5 to get the original weight which is 245 pounds.

Ivahew [28]2 years ago

3 0

Answer:

5. 3 / 0.1 = 30 students

6. 49 / 0.2 = 245 lbs

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Fourteen out of 20 teens said they eat breakfast every morning what is a reasonable prediction for the number of teens out of 12

Oksi-84 [34.3K]

Answer:

896

Step-by-step explanation:

14 of 20 teens eats breakfast every morning.

The percentage of those who eat breakfast every morning

= 14/20 x 100%

= 0.7 x 100%

= 70%

So, 70% of 20 teens eat breakfast every morning.

The reasonable prediction for the number of teens that eats breakfast every morning from 1280 teens will be 70% of 1280.

70/100 x 1280

0.7 x 1280

896

The prediction would be 896 out of 1280 teens eats breakfast every morning

8 0

3 years ago

In order to test for the significance of a regression model involving 3 independent variables and 47 observations, the numerator

matrenka [14]

Answer:

The correct option is C

Step-by-step explanation:

From the question we are told that

The number of independent variables is $n = 3$

The number of observation is $z = 47$

Since n is are independent variables then their degree of freedom is 3

The denominator(i.e z) degrees of freedom is evaluated as

$Df(z) = z - (n +1)$

$Df(z) = 47 - (3 +1)$

$Df(z) = 43$

So for the numerator (n) the degree of freedom is Df(n) = 3

So for the denominator(i.e z) the degree of freedom is Df(z) = 43

4 0

3 years ago

How many ways can 4 pizza toppings be chosen from 12 available toppings

Arisa [49]

Answer:

There are 495 different ways to choose 4 pizza toppings from 12.

Step-by-step explanation:

12!/8!4! = 12*11*10*9/(4*3*2) = 11*9*5 = 495

5 0

2 years ago

Read 2 more answers

The distance between port M and port N is 162m. A ship left port M with a speed of 45 mph. In 45 minutes another ship left port

matrenka [14]

Answer:

After 900 minutes

Step-by-step explanation:

when we convert the velocities of the ships into miles/ min we get

$45mph=45m/60min=0.75m/min$

$36mph=36m/60min=0.6m/min$

The equations determining the distances of the ships from the port M (set at x=0) are

$D_1=0.75t$ (for 45mph ship)

$D_2=162+0.6(t-45)$ (for 36mph ship)

The solution to these equation lie at t= 900 minutes; therefore the two ships will meet 900 minutes after the departure of the first ship.

8 0

2 years ago

Read 2 more answers

A club has members from three grades.

mars1129 [50]

the ratio is 24:30

or the simplified version is 4:5

7 0

2 years ago