Your final answer for this question is -3(y-2)/2. Hope this helps.
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Explaining? Simple!
1. In order to find the answer you simply change 25% to decimal form then multiply by your brushes. Then subtract your value from the original:
25% ⇒ .25 [Note: All percentages are less than one]
[840 x .25] = 210
[840 - 210] = 630.
840 decreased by 25% is 630.
2. For this one, you do the exact same thing as the first one, except you add since it is being increased. So convert 7% to decimal form and then multiply it by your money. The add this value to the original:
7% ⇒ .07 [*Note*: This is 7% not 70%]
[84 x .07] = 5.88
[84 + 5.88] = $89.88. (Don't forget to add your symbols!).
$84 increased by 7% is $89.88!
Density is mass/volume.
40.5g/15.0mL = 2.7g/mL
