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50 cm in meters is 0.5 m
Area covered by a tile = 0.5 * 0.5 = 0.25 m^2
Total area for floor = 5 * 4 = 20 m^2
Tiles required = 20/0.25 = 80 tiles
If 10 tiles cost £7.50 then 1 tile = <span>£7.50/10
then 80 tiles = 7.50/10 * 80 = </span><span>£60.00</span>
Answer:
You must pick at least 13 pennies to be sure of getting at least five from the same year.
Step-by-step explanation:
You have:
12 1967 pennies
7 1868 pennies
11 1971 pennies.
how many must you pick to be sure of getting at least five pennies from the same year?
This value is the multiplication of the number of different pennies by the antecessor of the number of pennies you want, added by 1.
So
You have 3 differennt pennies
You want to get at least five from the same year.

You must pick at least 13 pennies to be sure of getting at least five from the same year.
For example, if you pick 12 pennies, you can have four from each year.
Adding three values, 13 is the smallest number that you need at least one term of the addition being equal or bigger than 5.
The total expenses of Marco's account are $174. The ending balance is $81. So, the starting balance will be $255.
Option A is correct for starting balance.
Further Explanation on Starting and Ending Balance
Given that Marco’s bank statement says that he has an ending balance of $81. The expenses $ of Marco is given as,
- T-shirt 20
- Gas 22
- Movie 13
- Video game 39
- Jeans 34
- Hat 15
- Books 31
The total expenses can be calculated as given below.
Total Expenses = Sum of all Expenses
Total Expenses = 20+22+13+39+34+15+31
Total Expenses = $174
The starting balance can be calculated as given below.
Starting Balance = 
Starting Balance = $ 255.
Hence we can conclude that the starting balance of Marco's account is $255. Option A is correct.
To know more about expenses, follow the link given below.
brainly.com/question/24803457.
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