Question

求高手！解决英文的数学题啊！！！！拜托了啊！！！！！！！！！1

1. Ben has four more than twice as many CDs as Jack . If they have a total of 31 CDs , how many CDs does Jack have ?
2. Jack wants to replace the flooring in his rectangular Kitchen . He calculates the area of the floor to be 12.8 square meters , The actual area of the floor is 13.5 square meters . What is the relative error in calculating the area of the floor , to the nearest thousandth?
3.A right triangle contains a 38° angle whose adjacent side measures 10 centimeters. What is the length of the hypotenuse , to the nearest hundredth of a centimeter ?
4.On the set of axes below , graph and label the equations y=|x| and y=3|x| for the interval -3小等于x小等于3.（要图啊！）
5.On the set of axes below , solve the following system of equations graphically and state the coordinates of all points in the solution set . y=-x²+6x-3 x+y=7.(要图）

Answer 1

1. assume that Jack has x CDs. Then Ben has 2x +4 CDs. Then we have the equation x+ 2x+ 4 = 31.然后解方程这个你应该会吧。

2.（12.8 -13.5）/ 13.5 精确到千分位。

3.根据三角函数的关系，cos 38 = 10/x (x为斜边), 解 x = （cos 38）/10 ，自己按计算器，精确到千分位。

4. 没法传图，不过注意 两个函数的形状都应该是V字形，3|x|的斜率是3和-3，|x|的斜率是1，自己再好好思考一下。

5.用画图计算器画出两个方程，他们的交点就是方程组的解集，两个coordinate应该是(2,5) , (5,2)。你也可以尝试用代数的方法解。（联立两个方程，解一元二次方程）

希望对你有所帮助。

Answer 2

学数学好的......学英语都是差的（至少我是）
看到一大串英语......我晕了............
为什么不试试先翻译为中文再发上来呢？！

Answer 3

第一题就是本的CD是杰克的CD数的二倍多四 如果他们一共有31张CD 请问杰克有多少张？ 剩下的也没什么意思 请楼主以后翻译好之后再发

Answer 4

1.Ben有22张CD，Jack有9张CD。（Ben have 22 CDs and Javk have 9 CDs.）
2.Between the floors there have some crevices and the crevices occupy the aero too.
3.