The density of aluminum is 2.70 g/cm3. A square piece of aluminum foil, 22.86 cm on a side is found to weigh 2.568 g. What is the thickness of the foil, in millimeters?

0.133 mm

Step-by-step explanation:

From the question,

Density (D) = mass (m)/Volume (V) Equation 1

D = m/V

make V the subject of the equation

V = D×m Equation 2

Given: D = 2.7 g/cm³, m = 2.568 g

Substitute into equation 2

V = 2.7(2.568)

V = 6.934 cm³.

But,

Thickness (n) = Volume/Area

n = V/A Equation 3

Where A = Area of the square foil  = 22.86² = 522.58 cm²

n = 6.934/522.58

n = 0.0133 cm.

n = 0.133 mm

180 square centimeters

step-by-step explanation:

$3720

step-by-step explanation:

taxable income = $31000

as per the 2018-2019 us tax bracket, the tax rate is 12% for an individual whose taxable income is between $9,526 to $38,700.

so, the tax to be paid by him = 12% of 31000

= 0.12 * 31000     [12% converted to decimal as 0.12]

= $3720