If you mean the 146C, the bottom number (6) indicates the total number of protons. This is always 6 in the case of carbon. The top number is the sum of protons and neutrons, which for this particular isotope is 14 (i.e., carbon-14 has 8 neutrons).
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Top is numerator. Bottom is denomenator.
First, multiply the top numbers: 32x15=480 Then multiply the bottom numbers 12x12=144 Then put the product of the top numbers of the product of the bottom numbers: 480/144 Then reduce! 10/3
Bottom/top numbers in fraction in that order
27/40 67.5/100 = 135/200 (multiply top and bottom by 2 to make whole numbers) = 27/40 (divide top and bottom by hcf(135, 200) = 5)
Matrix multiplication is when you multiply the numbers inside different matricies.[topleft#1]Xtopleft#2=top left topright#1XBottomleft=top right bottom left X Topleft=top left bottom rightX bottom right=bottom right Scalar multiplication A number out side a matrix multiplies all parts of the matrix