Find the area. a) 411.3 mi² b) 407 mi² c) 452.16 mi² d) 357.3 mi²

c. 452.16

Step-by-step explanation:

A=πr2=π·122≈452.38934

411.29 mi²

Step-by-step explanation:

The area of the full circle is πr², which here is π(12 mi)², or 144π mi².

Three fourths of this total area comes to 108π mi².  To this we add the area of the triangle, which is A = (1/2)(base)(height), or, here, A = (1/2)(12 mi)(12 mi) = 72 mi²

The total is 108π mi² + 72 mi² = 411.29 mi²

answer: t=3

step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)