8 h 30 min =7h 100 m 7h 100min-4h 55 min=3h 45 min
Unless you have a value for 'h', the answer will just be an expression: 10 + 7h
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(7h + 35) / (-7) = (7h)/(-7) + (35)/(-7) = (-h) + (-5) = - (h + 5)
1-h
8 h 30 min =7h 100 m 7h 100min-4h 55 min=3h 45 min
4h + 7h - 16 = 6 Combine like terms: 11h - 16 = 6 Add 16 to both sides: 11h = 22 Divide both sides by 11: h = 2
Unless you have a value for 'h', the answer will just be an expression: 10 + 7h
7h - 2 - 51 is an expression NOT an equation. An expression cannot be solved for the value of a variable.
It is: 11h
The shades of graphite pencil from lightest to darkest are typically categorized as 9H (lightest), 8H, 7H, 6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B, 6B, 7B, 8B, 9B (darkest). The 'H' pencils are harder and lighter, while the 'B' pencils are softer and darker.
The order of hardness goes:9H 8H 7H 6H 5H 4H 3H 2H H F HB B 2B 3B 4B 5B 6B 7B 8B 9B hard medium soft
According to wikipedia hydrogen has three naturally occuring isotopes, 1H, 2H and 3H. 4H through 7H have been created in the laboratory but they are very short-lived.
here is a web site with a page on pencils www.easydrawinglessons.com
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H stands for hardness and B stands for blackness this is how a pencil scale goes: 9H 8H 7H 6H 5H 4H 3H 2H 1H H HB B 1B 2B 3B 4B 5B 6B 7B 8B 9B9H is very fine hard and light but 9B is thick black and very soft (more like charcoal)
Pencils are all marked on a European system called the degree scale where H is hardest and B is blackest.Pencils can be marked as;9H, 8H, 7H, 6H, 5H, 4H,3H,2H, H F,HB, B, 2B, 3B, 4B ,5B ,6B ,7B ,8B ,9BH pencils have a higher concentrate of clay than graphite, whereas the B pencils have a much lower percentage of clay.The B pencils make soft, dark marks, whereas the H pencils have a much harder, lighter mark.The F pencil stands for fine point, which is slightly harder than the HB making it a good writingpencil.