A disc is a circle so the formula for the area is pie r^2. So plugging in the numbers bring in the answer of 18.53
10.) id go for a more comfortable seat then a uncomfortable seat because i dont want to b uncomfortable riding my bike but if u like to stand when u ride a bike than a uncomfotable seat cuz u wouldnt have to seat on it that much since u stand when u ride a bike
Gold. Malleable means you are able to for example, hit it with a hammer and have it change shape (flatten or dint or bend) without snapping or smashing.
Density is calculated as mass divided by volume. We are given the mass of 15.0 grams, so we need to find the volume. For a cube, volume is calculated as (length of side)^3, so in this case, we have the length of a side as 44.5 mm, which is equivalent to 4.45 cm.
Volume = (4.45 cm)^3 = 88.1 cm^3
Then we divide mass by the volume:
Density = (15.0 grams) / (88.1 cm^3) = 0.170 g/cm^3
So the correct answer is A.