Buffers are usually of three types: Acidic buffers: They consist of a weak acid and its salt of a strong base. Th â¦ ey keep the pH constant in the acidic range.Basic buffers: They consist of a weak base and its salt of a strong acid.
I always go with SPF 50+. But, to be honest, there is not *that* much difference on a daily basis from SPF 25 to SPF 50: To figure out your level of protection, divide 1 by the SPF number.That equals the percentage of rays that are allowed to pass through. So SPF 25: 1/25 = 4% of rays pass through.SPF 50 = 1/50 = 2% of rays pass through. always go with SPF 50+. But, to be honest, there is not *that* much difference on a daily basis from SPF 25 to SPF 50: To figure out your level of protection, divide 1 by the SPF number.
25 and 65. Set up a systems of equations 1)a*b = 1625 2)a+b = 90 Therefore, according to the second equation, a = 90 - b. Plug that value of a into the first equation, and â¦ you will get that (90 - b) * b = 1625.This simplifies to b(squared) - 90b + 1625 = 0. This then simplifies to (b-25)(b-65) = 0. From there, solve for b and you will get 25 and 65.Answered.f we want two numbers to add to -1 then the two numbers must be of the form n and -(n+1). If we want two numbers to multiply to -72 then the two numbers must be of the form n â¦ and-m. It makes sense to look at factors of 72 which satisfy these equations. In this case, the only solution is 8 and -9.