All categories

3 years ago

If each 15 students will give a one and a half minute speech in English class how long would it take to give the speeches

Mathematics

2 answers:

Debora [2.8K]3 years ago

4 0

Just adding 1 and a half minutes together 15 times, you'd get 19 and a half minutes.

solmaris [256]3 years ago

4 0

One speech duration = 1.5 minute
15 speeches duration will be = 1.5*15=22.5 minutes

You might be interested in

A man realizes he lost the detailed receipt from the store and only has the credit card receipt with the after-tax total. If the

Eva8 [605]

Heyyy hit me up if u want help.

3 0

3 years ago

Read 2 more answers

An economy package of cups has 460 green cups. If the green cups are 20% of the total package, how many cups are in the package?

Oksi-84 [34.3K]

2300 cups because if 460 is 20%, multiply the 460 x 5 to get 100%

3 0

3 years ago

4. a) A ping pong ball has a 75% rebound ratio. When you drop it from a height of k feet, it bounces and bounces endlessly. If t

Klio2033 [76]

First part of question:

Find the general term that represents the situation in terms of k.

The general term for geometric series is:

$a_{n}=a_{1}r^{n-1}$

$a_{1}$ = the first term of the series

$r$ = the geometric ratio

$a_{1}$ would represent the height at which the ball is first dropped. Therefore:

$a_{1} = k$

We also know that the ball has a rebound ratio of 75%, meaning that the ball only bounces 75% of its original height every time it bounces. This appears to be our geometric ratio. Therefore:

$r=\frac{3}{4}$

Our general term would be:

$a_{n}=a_{1}r^{n-1}$

$a_{n}=k(\frac{3}{4}) ^{n-1}$

Second part of question:

If the ball dropped from a height of 235ft, determine the highest height achieved by the ball after six bounces.

$k$ represents the initial height:

$k = 235\ ft$

$n$ represents the number of times the ball bounces:

$n = 6$

Plugging this back into our general term of the geometric series:

$a_{n}=k(\frac{3}{4}) ^{n-1}$

$a_{n}=235(\frac{3}{4}) ^{6-1}$

$a_{n}=235(\frac{3}{4}) ^{5}$

$a_{n}=55.8\ ft$

$a_{n}$ represents the highest height of the ball after 6 bounces.

Third part of question:

If the ball dropped from a height of 235ft, find the total distance traveled by the ball when it strikes the ground for the 12th time. 

This would be easier to solve if we have a general term for the <em>sum </em>of a geometric series, which is:

$S_{n}=\frac{a_{1}(1-r^{n})}{1-r}$

We already know these variables:

$a_{1}= k = 235\ ft$

$r=\frac{3}{4}$

$n = 12$

Therefore:

$S_{n}=\frac{(235)(1-\frac{3}{4} ^{12})}{1-\frac{3}{4} }$

$S_{n}=\frac{(235)(1-\frac{3}{4} ^{12})}{\frac{1}{4} }$

$S_{n}=(4)(235)(1-\frac{3}{4} ^{12})$

$S_{n}=910.22\ ft$

8 0

3 years ago

The school cafeteria serves tacos every 6th day and cheeseburgers every 8th day. If tacos and cheeseburgers are on today's menu,

max2010maxim [7]

They will never be on the same day again .

8 0

4 years ago

PLZ HELP!!! question is in attachment

Triss [41]

Answer:

x = 72.5°

Step-by-step explanation:

x = 1/2(80 + 65)

x = 145/2

x = 72.5

4 0

3 years ago