Answer: 10 weeks
Step-by-step explanation: the first step is to subtract
400-250=150.
So he needs to save $150 to make $400.
Divide $150/$15 =10.
It means he has 10 weeks more to save for $150 to make $400.
Therefore the final answer is 10 weeks
Answer:
The question is wether for the first positive value we consider (-4)×(-2) or -4×(-2)
If every shelf has the same amount of books, then it can be seen as proportional because one shelf has 43 and 2 have 86, and it keeps going up in a consistent way.
so 43/1 = 86/2 .
Happy studying ^-^
Answer:
We can use seven letters and numbers.
I am assuming that any numeral in the range 0..9 or any letter from the English alphabet A..Z can appear in any position, with no blank spaces allowed and no restrictions on repetition. I am also assuming that plates with fewer than seven letters and numbers are not allowed.
So, for example A879BX8 is acceptable, so are 5555555 and ABCDEFG, but not A.123.ZX or…..7A, where the dot represents a space.
I am also assuming that you can only use upper case letters.
With these restrictions, there are 36 possibilities for each space and the total number of valid number plates would be 36^7 = 78,364,164,096, let's say about 78 billion.
It is estimated that there are about 1.3 billion cars, trucks and buses in the road today. This number plate system therefore allows more than enough unique license plates. I'd even hazard a guess that it might be more than enough for every road vehicle that has ever been built or ever will be.
In practice there would be other restrictions, for example only letters in some positions and only numbers in others. There'd still be plenty to go around.
Step-by-step explanation:
There are 3600 seconds in an hour.
3600x6 = seconds in 6 hours.
= 21,600 seconds.
48 hours in a 2 days. 3600 seconds each hour.
48x3600= 172,800 seconds.
