the diameter of a metallic ball is 4.2 cm . What is the mass of the ball , if the density of the metal is 8.9 gram per centimetre cube

I will not tell you the exact answer, but plug the radius(2.1) into the sphere equation and then use the mass formula to caculate the mass(you already have the density)

109.8972π or around 345.2 grams

Step-by-step explanation:

find volume

(4/3)π(2.1)^3=12.348π cm cubed

12.348π*8.9=109.8972π

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

$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