Question

英语数学题。请写一下题的翻译和详细步骤。谢谢大家~辛苦啦！有加分哈！

1..given that x is an odd number,find and simplify an expression, in terms of x, for the sum of the next two even numbers.

2.the total cost of an advertisement in a newspaper is obtained by adding together a fixed charge of 50 cents and a charge of 15cents per word.
1).calculate the total cost of an advertisement containing 11 words
2).the total cost of an advertisement containing n words is C cents。
find a formual for C in terms fo n .
3).arthur does not want to spend more than $3.00 on an advertisement.
what is the greatest number of words he can use?

Answer 1

1. 已知x是一个奇数，用x表示下2个偶数的和，并简化
x+1+x+3
=2x+4

2.一条报纸广告的费用是固定成本5毛加上1毛5每个词
1)计算一条11个词的广告要多少钱
.5+11(.15)=2.15$
2)一条n个词的广告要C分钱，用n表示C
C=50+15n
3)作者不想花超过3块钱在一条广告上，他最多可以用几个词？
3>.5+.15n
n=16

追问

谢谢啦。你好厉害哦。哈。还有一个题哈。不好意思啦。
John is x years old his sister Mary is (5x-12) years old . give that Mary is twice as old as John,
1).write dwon ,in terms of x ,an equation connecting their ages,
2).solve the equation for x
3).find Mary's age
再辛苦一下哈。

追答

我去~着小学生数学题还没完没了了~楼主小学上的真辛苦~

john x岁~他姐 mary 5x-12岁.已知 mary年龄是john两倍~
1) 用x写一个公式来表示他们年龄的关系
5x-12=2x
2) 解x
3x=12
x=4
3)mary今年多大？
2x=8
mary 8岁

Answer 2

楼上正确 建议采纳