中一英文數學

1.A box of model with marked price of $600 is sold at 10% less.

(a) Find the discount.
$600*10%
=$60
(b)Find the selling price.
$600-$60
=$540

2.The volume of a cuboid is 3150cm3.If its height and length are 15cm and 35cm
respectively.fund its width.
3150/15/35 cm (=除
=6cm

3.In the figure,OABC is square and the coordinates of Bare (-4, -4)

(a) Find the coordinates of the points A and C
o is origin?
if yes, A:(0,-4)
C:(-4,0)

(b)Find the perimeter of square OABC.
perimeter of OABC=OA+AB+BC+CO
=(0-(-4))+(0-(-4))+(0-(-4))+(0-(-4))cm
=16cm
　　　　　　

1a. Discount= $600 x 10% = $60
b. Selling price=$600x(1-10%)=$540/ $600-$60=$540
2.Let the width be y,
y x 15 x 35=3150
y=6
Its width is 6cm
3a. Coordinates of the points A: (0,-4)
Coordinates of the points C: (-4,0)
b. Length of AB=0-(-4)=4
Perimeter= 4x4 =16 units