[計量] 幾題計請教 疑似答案有誤
1. The toll for a certain bridge is $0.15 or 1 token. Tokes are sold in pack
of 40 for $4.00
A) The ercent saved on 40 trips across the bride if a token, rather than $0.15
, is used to pay each toll.
B) (66+2/3)%
答案A)
自己算是 A=33% < B
2. T is no more than 20 percent greater than the integer x, and T is no
smaller than a number 20 percent less than the integer x. If T = 60,
which of the following indicates the smallest possible interval for x?
Ans: 50 <= x <= 75
3. A line in the xy-coordinate plane has x-intercept a and y-intercept b,
where a and b are nonzero. The slope of this line is?
Ans: -b/a
not a/b????
感謝幫忙
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