How do you round 2.8497 × 10^3 and 349.69 to 3 significant figures?
when i have inserted [what i thought was the correct answers] ie; 350.0 and 2.85, i was told it was incorrect.

Your answer for rounding 2.8497 x 10^3 is correct: 2.85 x 10^3.

350.0 is not correct because it has 4 sig figs. The proper rounding would be simply 350. with not additional zeros.

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo