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## Question

primary 6 | Maths
| Geometry

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Can anyone pls help me with this two questions ASAP thanks

(a) Total spending

= 4 Pencils + 1 Pen + 1 Eraser

= 4 x 2d + (d + 85) + (d - 15)

= 8 x d + d + 85 + d - 15

= 8d + d + d + 85 - 15

= (10d + 70) cents

(b) Cost of pen

= d + 85

= 25 + 85

= 110 cents

Cost of eraser

= d - 15

= 25 - 15

= 10 cents

Difference in cost of pen and eraser

= 110 - 10

= 100 cents

= $1

Let the top of the triangle be called R

The angle next to the 104 degrees is k, since RPQ = RBC = k before it is folded inwards (we call this corresponding angles)

For the right side figure, the top left angle is 104 + k.

The bottom left angle is k.

These two add up to 180 degrees (the sum of angles in such manner, I call it as interior angles between parallel lines, is 180 degrees)

So,

k + (104 + k) = 180

k + 104 + k = 180

k + k + 104 = 180

2k + 104 = 180

Subtracting 104 from both sides,

2k + 104 - 104 = 180 - 104

2k + 0 = 76

2k = 76

Dividing both sides by 2,

2k/2 = 76/2

1k = 38

k = 38

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