50 billion = 5 x 1010 The square of this number is (5 x 1010)2 = 25 x 1020 = 2.5 x 1021 = 2,500,000,000,000,000,000,000.
2.5*1010*3.5*(10-7) = 26512.5
2.5 x 1010 x 3.5 x 10 - 7 = 88368
13130
0.000000000751 = 7.51 x 10-10 Since you need to move the decimal point 10 places to the right, the exponent of 10 will be -10. What really you are doing is you are multiplying the given number by 1 represented as 1010/1010 : 0.000000000751 x 1010/1010, where 1/1010 = 10-10.
(4 x 25 + 1) x 10
50 billion = 5 x 1010 The square of this number is (5 x 1010)2 = 25 x 1020 = 2.5 x 1021 = 2,500,000,000,000,000,000,000.
The Angstrom is a very small unit of linear measure. It so small that it is used in spectrometry to express the wavelength of light. It is 1 x 10-10 meters (or 10-10 m). That means that there are 1 x 1010 (or 1010) angstroms in just 1 meter. A kilometer (km) is 1000 meters, which is 103 meters, so there would be 1013 angstroms in a kilometer. (We add exponents: 1010 x 103 = 1010 + 3 = 1013.) As there are 1013 angstroms in a kilometer, there will be 10-13 kilometers in an angstrom. (We inverted to find that.) If you have 25 angstroms that you want to convert to kilometers, that's 25 x 10-13 kilometers in the 25 angstroms.
The pH of a solution with a concentration of H+ ions of 1.25 x 10^10 would be calculated as pH = -log[H+]. Therefore, pH = -log(1.25 x 10^10) ≈ 9.9. This solution would be basic.
percentage = 5 x 1010%5000 x 105 x 100% = 5000 x 107% or 5 x 1010%
2.5 x 1010 x 3.5 x 10-2 = 88.375
55,550.
2.5*1010*3.5*(10-7) = 26512.5
2.5 x 1010 x 3.5 x 10 - 7 = 88368
13130
You calculate this as 1010 over 66 - that is:(1010 x 1009 x 1008 x 1007 x ...) / (1 x 2 x 3 x 4 x ...) with a total of 66 numbers at the top and at the bottom. Excel can help you with the actual calculations.
0.000000000751 = 7.51 x 10-10 Since you need to move the decimal point 10 places to the right, the exponent of 10 will be -10. What really you are doing is you are multiplying the given number by 1 represented as 1010/1010 : 0.000000000751 x 1010/1010, where 1/1010 = 10-10.