一道数学英文题,此外the area of the base of the cube是什麼意思?
一道数学英文题,此外the area of the base of the cube是什麼意思?
1)the cost ,in dollars,of manufacturing x refrigerators is 9000+400x.the amount received when selling these x refrigerators is 500x dollars.what is the least number of refrigerators that must be manufactured and sold so that the amount received is at least equal to the manufacturing cost?
A10
B18
C45
D90
E100
2)the area of the base of the cube是什麼意思?