Which of these is a correct expansion of (3x -2)(2x^2+5)

B

Step-by-step explanation:

Given

(3x - 2)(2x² + 5)

Each term in the second factor is multiplied by each term in the first factor

= 3x(2x² + 5) - 2(2x² + 6) ← distribute both parenthesis

= 3x × 2x² + 3x × 5 +(- 2) × 2x² +(- 2) × 5 → B

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)