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<span>Using place value to exchange equal amounts when renaming a number is called : Regroup
Simple example for a group is when you try to add up :
86 + 25
86 has 8 group of tens and 6 groups of one
25 has 2 groups of tens and 5 groups of one
after adding that up , now the number has 11 group of tens and 1 group of one, the result of that equation would be : 110</span>
Answer:
50% profit
Step-by-step explanation:
Cost price = £ 5000
Selling price = £ 7500
Profit = Selling price - cost price
= 7500 - 5000
= £ 2500
Profit percentage = 
= 50 %
Answer:
15.7 units
Step-by-step explanation:
AB = 6, BC = 3
Therefore by Pythagoras theorem
AC =

Answer:
3.21003271 x 10^8
Step-by-step explanation:
1. Add a decimal to the end of the number
2. Move the decimal left until your number is less than 10 but greater than 1
3. Count how many times you moved your decimal
4. Write the number of times you moved your decimal as the exponent
Sorry if the steps confuse you also Scientific Notation is my specialty