Lydia started collecting seashells when she was five years old. At age seven, Lydia had 12(10)² seashells. At age nine, Lydia had 24(10)²seashells. At age eleven, Lydia had 48(10)² seashells. Lydia wants to collect 75(10)³ seashells. Lydia continues to collect seashells at the same rate. How old will Lydia be when she has 75(10)³ seashells? Show all your mathematical thinking. Lydia will be 13 when she has 75(10)

all but the second one

step-by-step explanation:

cuz that one goes over 180

mark brainliest

answer: 1 and 3

step-by-step explanation:

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

it is true

step-by-step explanation:

all the combinations add up i used   calculator