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spin [16.1K]
3 years ago
15

Does this picture represent a physical or a chemical change?

Mathematics
2 answers:
skad [1K]3 years ago
8 0
Chemical because it is forming into a new substance
AnnyKZ [126]3 years ago
7 0

Answer:

Chemical

Step-by-step explanation:

Brainliest please?♡

You might be interested in
A radioactive substance decays at a continuous rate of 12% per year, and 90 mg of the substance is present in the year 2000. (a)
Alla [95]

Answer:

A(t) = 90e^0.12t ;

299 mg

Step-by-step explanation:

General Continous growth rate equation :

A = Pe^rt

A = amount present, t years after year of initial amount.

Here,

P = 90 mg, amount in year 2000

r = rate = 12% = 0.12

t = years after 2000

Therefore,

A is written as ;

A(t) = 90e^0.12t

Amount present in year 2010 ;

t = 2010 - 2000 = 10

A(10) = 90e^0.12(10)

A(10) = 90 * e^1.2

= 90 * 3.3201169

= 298.81052

= 299 mg

5 0
2 years ago
Find the area and the circumference of a circle with a diameter 8yrd.
nalin [4]

Answer:

Part 1) The area of the circle is A=50.24\ yd^2

Part 2) The circumference of the circle is C=25.12\ yd

Step-by-step explanation:

step 1

The area of a circle is equal to

A=\pi r^{2}

we have

r=8/2=4\ yd ---> the radius is half the diameter

\pi =3.14

substitute

A=(3.14)(4)^{2}

A=50.24\ yd^2

step 2

The circumference of a circle is equal to

C=\pi D

we have

D=8\ yd

\pi =3.14

substitute

C=(3.14)8

C=25.12\ yd

3 0
3 years ago
4.185 divided by 0.93 rounded
mr Goodwill [35]
To the nearest whole: 4
to the nearest hundredth: 4.2
actual answer: 4.5
4 0
3 years ago
Help please can y’all please answer 4-6 please
Stels [109]

Answer:

4. the circumference = approx. 21.99

5. 30 feet

6. 150.8 feet

Step-by-step explanation:

4: 3.5*π*2= 21.99

5:. 1800÷60= 30

6. circumference equals approx. 37.7 feet and I multiplied that by 4 because the boy went around 4 times

hope this helps <3

7 0
3 years ago
The researcher is interested to know if policy A (new) is more effective than policy B (old). Frame the hypothesis and describe
vesna_86 [32]

<u>Answer:</u>

<u>Null hypothesis: Policy B remains more effective than policy A.</u>

<u>Alternate hypothesis: Policy A is more effective than policy B.</u>

<u>Step-by-step explanation:</u>

Remember, a hypothesis is a  usually tentative (temporary until tested) assumption about two variables– independent and the dependent variable.

We have two types of hypothesis errors:

1. A type I error occurs when the null hypothesis (H0) is wrongly rejected.

That is, rejecting the assumption that policy B remains more effective than policy A when it is <em>actually true.</em>

2. A type II error occurs when the null hypothesis H0, is not rejected when it is actually false. That is, accepting the assumption that policy B remains more effective than policy A when it is <em>actually false.</em>

3 0
3 years ago
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