НАЙТИ ОШИБКИ В ПИСЬМЕ!! Exercise 8. Here are three extracts from letters that break some rules.
1.Decide what is wrong with each one and underline any mistakes or faults.

1)I noticed your advertisement in the Daily Planet and I would be grateful if you could send me further information about your products. My company is considering subcontracting some of its office services and I believe that you may be able to supply us with a suitable service. Looking forward to hearing form you.
2)Thank you very much for you letter of 15 January, which we received today. In answer to your enquiry we have pleasure in enclosing an information pack, giving full details of our services. If you would like any further information, do please contact me by phone or in writing and I will be pleased to help. I hope that our services will be of interest to you and I look forward to hearing from you. Yours sincerely,
3)There are a number of queries that I would like to raise about your products and would be grateful if you could ask a representative to get in touch with me with a view to discussing these queries and hopefully placing an order if the queries are satisfactorily answered.

1. We need to decide how to celebrate your birthday,

2 You needn't to go to the shop. I have bought everything we need.

3. Pupils must wear uniforms at school. It's a rule!

4. They don't have to cook dinner. Mother has done it.

5. People mustn't cross the street when traffic lights are red!

6. You have to do morning exercises! It's very useful!

7. May I take your pen? I have lost my pen

8. My friend can't speak English, but he speaks French.

9. You shouldn't go out if you feel not very well.

10. I should to take my umbrella, it's raining

Объяснение:

the side surface of this pyramid consists of 6 isosceles triangles with a base 16 and a side 17.

Find the area of one triangle.

S = 1/2bh, where b is the base and h is the height.

The height is found by the Pythagorean theorem.

The height is equal to the square root of the difference between the squares of the side of the triangle and the half of the base. Half of the base 16 / 2 = 8

17*17 - 8*8 = 225. The square root of 225 is 15. The height of the triangle is 15. Then the area of the triangle will be equal to S = 1/2*16*15 = 120 and the area of the side surface of this pyramid is equal to the area of one triangle multiplied by 6. S1 = 120 * 6 = 720