Physical properties are anything that will change how it looks but not how it acts.
for example one could be a phase change. where water turns into steam. which is just water in gas form
another example would be pebbles are just rocks but crushed up.
and another physical change would dents. like if you hit a table and it got a dent. it's still a table just with a dent.
chemical changes change the actual way the chemical works.
the way you can tell is by if it gets heat or has a new property that wants their before.
some examples would be lighting wood on fire. it changes the composition of the wood and now it is no longer flammable.
another one would be burning magnesium. it becomes a new substance when you burn it.
the last example could be photsynthiss. you start with carbon and water and turn it into glucose and oxygen
Obviously, 2013. 2013-2014 (1 year) 2014-2015 (2 years) etc etc
Answer:
<u>Turn 6 2/3 into an Improper Fraction</u>
Multiply and get 18. Now add and get .
<u>Do Keep Change Flip</u>
Keep:
Change: ÷ into ×
Flip: 20/3 into 3/20
Your new Problem:
<u>Multiply</u>
<u>Simplify</u>
QUESTION:
The code for a lock consists of 5 digits (0-9). The last number cannot be 0 or 1. How many different codes are possible.
ANSWER:
Since in this particular scenario, the order of the numbers matter, we can use the Permutation Formula:–
- P(n,r) = n!/(n−r)! where n is the number of numbers in the set and r is the subset.
Since there are 10 digits to choose from, we can assume that n = 10.
Similarly, since there are 5 numbers that need to be chosen out of the ten, we can assume that r = 5.
Now, plug these values into the formula and solve:
= 10!(10−5)!
= 10!5!
= 10⋅9⋅8⋅7⋅6
= 30240.