Kwesi is putting on sunscreen. he uses 3\text{ ml}3 ml to cover 45 \text{ cm}^245 cm 2 of his skin. he wants to know how many milliliters of sunscreen (g)(g) he needs to cover 240\text{ cm}^2240 cm 2 of his skin. he assumes the relationship between milliliters of sunscreen and area is proportional.

Kwesi needs 16 ml or 16 g of sunscreen to cover 240 cm² of his skin.

Step-by-step explanation:

It is given that Kwesi is putting on sunscreen. He uses 3 ml to cover 45 cm² of his skin.

Let Kwesi needs x ml of sunscreen to cover 240 cm² of his skin.

It is given that relationship between milliliters of sunscreen and area is proportional.

Divide both sides 45.

We know that

Therefore Kwesi needs 16 ml or 16 g of sunscreen to cover 240 cm² of his skin.

goog may have it for you

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)