Question

几道数学题想请大家帮帮忙!!!!!

天生数学不好,所以想请大家帮个忙解答,要有解析、步骤和答案!!
1.The area of a piece of rectangular land shown in the figure is known to be no more than[2(x square)+9]m square.
(a) Find the range of the values of x.
(b)Find the maximum area of the piece of land.

2.A theatre is designed to accommodate at least 500 audiences and there are 15 seats each row.
(a)What is the least number of roe in the theatre?
(b)Using the result (a).If three seats are added each row,can the theatre accommodate 600 audience?

3.If 2x-3 ÷ 4≥ 4x-1÷3 +1,find the range of values of x.

5.A piece of wire of 5m long is cut into x pieces of 15cm long and 17 pieces of 10cm long.What is the maximum number of pieces of wire 15cm long?

P.S.要有步骤和解释!!!!!!!

我的作业是英语写所以...谢谢各位,放在这栏了我...

Answer 1

1. 没图

2. 500/15 约为 34(排数没有小数）
34*18 = 612

3.要确认一下题目，有没括号？
按照你的题目， 题目是 2x - 3/4 >= 4x - 2/3
所以 -2x >= 1/12
x<= - 1/24

5. total length of 17 pieces of 10 cm
= 17 *0.1=1.7m
max length left = 5 - 1.7 = 3.3m
no of pieces max = 330 / 15 = 22pieces

中间我省略了些单位换算 1m= 100CM

Answer 2

和他一样