兩條maths題 [急!!!]

[匿名]

2009-08-11 1:33 am

1. Ann had $ 100. She used part of her money to buy 7 ceramic cats, in which 3 of them are more expensive than the rest by $ 3. If she had $7 left, how much do the two types of ceramic cat cost?

2. If the area of triangle PQR is 21 sq. units, and the coordinates of R are (4, k), find the two possible values of k.

有冇人可以教我點做而兩題......最好有式!!!
唔該唔該

更新1:

第2題... the coordinates of P(-4, -3) Q(3, -3) R(4, k)

更新2:

重有幾題...真係麻煩哂 3. If the two adjacent sides of a square measure X cm and ( 2X -3 )cm respectively, find the perimeter of the square. 4. Solve the equation ( 3m ) 4 ----- - 2m - 8 = 0 5

回答 (2)

Suky

2009-08-11 1:36 am

✔ 最佳答案

1.
1.
Let the normal price of the cheaper ceramic cat be X
then the expensive one will be X+3
4X+3(X+3)=100-7
7X+9=93
7X=84
X=12
So, cheaper one is $12
Expensive one is $15

2009-08-10 17:36:52 補充：
你第二條的問題冇圖又冇其他座標,點答呀?

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用戶19657

2009-08-16 1:55 am

the 2,4, also can't ans ar!

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