The ratio of the surface areas of two similar pyramids is 16:9. If the volume of the smaller pyramid is 297 cm3 , find the volume of the larger pyramid.

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)

207/8 is the right

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1