两道SAT2的数学题,求英语数学专家!1.A cell phone provider charges 0.4刀 for the first minute of a call and 0.2刀 for each additional mitute or each additional portion of a minute.The cost of a call,C,is given by the model C=0.4+0.2T wher
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两道SAT2的数学题,求英语数学专家!1.A cell phone provider charges 0.4刀 for the first minute of a call and 0.2刀 for each additional mitute or each additional portion of a minute.The cost of a call,C,is given by the model C=0.4+0.2T wher
两道SAT2的数学题,求英语数学专家!
1.A cell phone provider charges 0.4刀 for the first minute of a call and 0.2刀 for each additional mitute or each additional portion of a minute.The cost of a call,C,is given by the model C=0.4+0.2T where T is the number of minutes over the first minute and T is the least integer greater than or equal to t.What is the cost of a 12.25-minute call?
85.
2.A teacher gives a test to 2 classes.The first class has 18 students and the second has 24 students.If the average for the first class is 84% and x is the overall average grade for all of the students,then which of the following is true.
完全不明白为什么取值范围是36《x《92
两道SAT2的数学题,求英语数学专家!1.A cell phone provider charges 0.4刀 for the first minute of a call and 0.2刀 for each additional mitute or each additional portion of a minute.The cost of a call,C,is given by the model C=0.4+0.2T wher
第一题大概是一种电话第一分钟0.4元,以后每分钟0.2元不足一分钟按一分钟记,话费的记取方式为C=0.4+0.2T,T为超过一分钟的时间且为不小于t的正整数.求12.25分钟的话费
C=0.4+0.2*（13-1）=2.8 觉得给的答案是不是有问题
第二题的大概意思是 一个老师给两个班测验,第一个班18人,第二个24人,假如第一个班的平均成绩是84,则两个班总的平均成绩取值范围为多少
(84*18+0*24）/(18+24)≤ x ≤（84*18+100*24）/（18+24）则36≤ x ≤93.14
注：我看你的题意应该是个选择题,可能由于不可能全为满分所以出现你那个答案
第一题，大概意思是一种电话通话收费第一分钟要0.4元，当大于一分钟时每分钟0.2元，于是有关系式C=0.4 0.2T（T≥1）当T=12.25时求通话费用。有C=0.4 0.2×12.25=2.85上课了先发了