31 Les maths autour de moi En 2010, l'explosion de la plateforme pétro-
lière Deepwater Horizon a causé une énorme
marée noire. En un mois, 100 millions de litres
de pétrole se sont déversés en mer.
En admettant que ce pétrole se soit étalé uni-
formément à la surface de l'eau pour former
une couche de 10-3 mm d'épaisseur, quelle
était l'aire (en km2) de la nappe de pétrole ?
35

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice

third choice down

step-by-step explanation:

the first inequality is based on the number of adults and campers, and the second inequality is based on the cost of feeding both the adult and the camper.

we know that there is room for 525 people max.   it's ok to have less than 525, but it's not ok to have more than 525, so the inequality is less than or equal to.   the number combination of adults (x) and campers (y) cannot exceed this 525 max.   therefore:

x + y ≤ 525

now we talk about cost.   it costs $9 to feed one adult, so depending upon the number of adults you have (x) depends upon how much it will cost to feed that number of adults.   same with the campers, who cost $5 to feed.   the adults can be represented by 9x and the campers can be represented by 5y.   since the budget cannot exceed 1,200, the second inequality is:

9x + 5y ≤ 1200

33/100 is what i got

73

step-by-step explanation:

7×3²+10

=7×9+10

=63+10

=73