Mathematics

Question

To decrease an amount by 8 percent, what single multiplier would you use?

1 Answer

  • That's far more problems than I usually accept in a single question, but since you're new and obviously a beginner, I'll try to help. 

    To Increase an amount by 7% what single multiplier would you use 
    We want 7% more than 100% of the amount, so the multiplier is 
    (100% + 7%) = 107% = 1.07 
    [Remember that "percent" means "per hundred," so we divide a percentage by 100 to get the numerical equivalent.] 

    To Decrease an amount by 7% what single multiplier would you use 
    We want 7% less than 100% this time, so the multiplier is 
    (100% - 7%) = 93% = 0.93 

    5 ÷ 0.1 
    = 50 

    (To One Decimal Place) (0.3 x 2.8)Squared 
    [Notation: around here we usually write "squared" as ^2, where the ^ is an exponentiation sign.] 
    (0.3 x 2.8)^2 = 0.84^2 = 0.7056 
    which is 0.7 when rounded to one decimal place. 

    6.38 + 4.52 ÷ 4.71 +9.53 
    = 6.38 + (4.52 ÷ 4.71) + 9.53 [assuming operations in the usual order] 
    = about 6.38 + 0.96 + 9.53 
    = 16.87 

    Expand and Simplify 
    (x + 2)(x + 3) 
    = x^2 + 2x + 3x + 6 
    = x^2 + 5x + 6 

    Expand and Simplify 
    (x + 2)(x - 3) 
    = x^2 + 2x - 3x - 6 
    = x^2 - x - 6 

    x + 1 < 5 
    x < 4 [subtracting 1 from both sides] 

    Make n the subject of the formula.... M=3n 
    3n = M 
    n = M/3
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