All categories

4 years ago

Write a question that matches this equation. 45 – n = 15

2 answers:

8 0

Hey there :)

45 - n = 15

Here are few examples:
· The difference between 45 and a number gives 15. What is the number?
· A number less than 45 gives 15. What is the number?
· 45 decreased by a number gives the difference 15. What is the number?
· 15 papers were left unused out of 45 papers. How many papers were used?
· Ray had $45 and he bought some grocery. He was given a change of $15. How much money did he use?

Archy [21]4 years ago

6 0

There were 45 birds on the field , when some of them flew away, only 15 left.
How many birds flew away?

You might be interested in

If you multiply my number by 6 and add the product to -4, the result is -40. What's my number?

Nikolay [14]

Answer:

I can totally help you but, what is your number by chance?

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

A solution initially contains 200 bacteria. 1. Assuming the number y increases at a rate proportional to the number present, wri

GuDViN [60]

Answer:

1. $\frac{dy}{dt}=ky$

2.543.6

Step-by-step explanation:

We are given that

y(0)=200

Let y be the number of bacteria at any time

$\frac{dy}{dt}$ =Number of bacteria per unit time

$\frac{dy}{dt}\proportional y$

$\frac{dy}{dt}=ky$

Where k=Proportionality constant

2. $\frac{dy}{y}=kdt$ ,y'(0)=100

Integrating on both sides then, we get

$lny=kt+C$

We have y(0)=200

Substitute the values then , we get

$ln 200=k(0)+C$

$C=ln 200$

Substitute the value of C then we get

$ln y=kt+ln 200$

$ln y-ln200=kt$

$ln\frac{y}{200}=kt$

$\frac{y}{200}=e^{kt}$

$y=200e^{kt}$

Differentiate w.r.t

$y'=200ke^{kt}$

Substitute the given condition then, we get

$100=200ke^{0}=200 \;because \;e^0=1$

$k=\frac{100}{200}=\frac{1}{2}$

$y=200e^{\frac{t}{2}}$

Substitute t=2

Then, we get $y=200e^{\frac{2}{2}}=200e$

$y=200(2.718)=543.6=543.6$

e=2.718

Hence, the number of bacteria after 2 hours=543.6

4 0

4 years ago

Sebastián está haciendo un curso de patinaje. El primer día recorrió una distancia de

jeyben [28]

Sorry but I don’t understand your language.

8 0

3 years ago

PROBLEM #5

andrezito [222]

Answer:

12.5%

Step-by-step explanation:

80 - 70 = 10

10 / 80 = 0.125

Convert decimal to percent.

0.125 = 12.5%

5 0

3 years ago

The mean of a set of data is 148.87 and its standard deviation is 68.29. Find the z score for a value of 490.19.

Ksivusya [100]

<span>The mean of a set of data is 148.87 and its standard deviation is 68.29. Find the z score for a value of 490.19
the z-score is given by:
z=(x-</span>μ<span>)/</span>σ
plugging in the values in the expression we get:
z=(490.19-149.87)/68.29
z=340.32/68.29
z=4.9835

6 0

4 years ago