a5+b5 = (a+b) (a4-a3b+a2b2-ab3+b4)
Well, formulas in general don't always start with a sign, but it might be talking about Excel, where they always start with an equal sign (=).
A1 will stay the same. B4 will become B5 and F6 will become F7.
type in e.g =AVERAGE(B5:C4)
You will enter the formula by chosing summation and then clicking the cells, while on cell d3, click enter.
Any even number can be expressed as a multiple of two. If you have 5 even numbers, then we can label them as such: a1 = 2*b1 a2 = 2*b2 a3 = 2*b3 a4 = 2*b4 a5 = 2*b5 Where bn is an arbitrary integer So we therefore have: a1 + a2 + a3 + a4 + a5 = 2*b1 + 2*b2 +2*b3 + 2*b4 + 2*b5 = 2*(b1 + b2 +b3 + b4 + b5) We can then let b1 + b2 +b3 + b4 + b5 = c because our sum of 5 numbers is equal to 2*c, this means that the sum is a multiple of 2, and therefore even. QED.
54
Excel formulas begin with an equal sign, for example:=SUM(A1:A7)will give you the total of the numbers in cells A1, A2, A3, A4, A5, A6 and A7.Array formulas start with = but are enclosed in brace bracket{}.You can also use the plus or minus sign to start a formula, but as soon as you press Enter, a plus will be converted into an equals sign and a minus sign will have an equals sign inserted before it, so the formula will still show as starting with an equals sign.+5+7 will become =5+7-10*2 will become =-10*2Lotus 123 was the big spreadsheet application before Excel. It used the @ sign to start its functions. In order to help people moving from using Lotus 123 to Excel, the ability to start functions with the @ sign was included in Excel, and you can still do that. This applies only to functions at the start of a formula, not any formula.
5B
An A1 piece of paper is approximately 23.4 x 33.1 inches or 594 x 841 millimeters. It is commonly used for posters, signage, and architectural drawings due to its larger size compared to standard paper sizes.
The formula will become: =B5+B6 What the actual total it shows will be, will depend on what is in B5 and B6.
What is B5 numder's