8 a delivery service charges $0.02 per ounce for the first 16 ounces ofa shipment and $0.15 for each additional ounce of theshipment,(1pound=16ounce)
the delivery charges for x shipments weighing a combimed total of the pounds vs 567.00
这道题答案选的是D,不明白怎么会无法确定呢?我是这样算的:16×0.2+(25*16-16)×0.15...这样对么?
因为x是个未知数，所以你无法确定它的值。中华考试网(www.Examw。com)
9 the cost per gram of carrots if 3 cans of carrots cost $0.90 the costper gram of onions if 5 cans of onions cost $1.50
无法确定，没有告诉1can有多少克?
10 X is an integer, and the remainder when 2X is divided by 4 is 0.
The remainder when X is divided by 4 0
选D，当x=2，-2时，余数为2，-2，其它情况为0
