Pre-Algebra Lesson 11-1
Write the equation for the area A of a circle with radius r. Write the answer in
terms of pie

Area of a circle is given by:

A = πr²

This is one of the most commonly used equation in math and physic, so i recommend that you memorize this.

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)

f(x) = y

f(-3) = -5

step-by-step explanation: