Сколько целых решений имеет неравенство?

-18<x<174 ? 

помогите пожалуйста глаголы в скобках поставить в правильном времени: present Simple or Present Continuous

He still (try) to find a job but there (not/be) much work available at present.
Believe me, I (think) of you all the time.
I (not/know) how they (make) both ends meet. They (have) six children and (not/earn) very much.
My mother (think) that hitch-hiking (be) dangerous.
The police (look) into the matter now.
People (like) stability in life.
They (open) a new McDonald's tomorrow.
The English (believe) that their home (be) their castle.
Mike (arrive) in three days. We can't wait until he (come). Everyone (look forward) to seeing him.
When he (have) a problem to solve he will work at it until he (find) an answer.
The equator (run) round the middle of the earth.
The English (like) coalfires even though they (not/pro¬duce) much heat.
My brother (not/care) very much what he (look) like.
A hot-air balloon (float) because hot air (be) lighter than cool air. A hot air balloon (consist) of a basket in which the pilot and the crew (stand), a gas burner and a large
balloon.
As soon as doctors (find) an answer to AIDS, they will be able to cure people.
You (look) great after your holiday! - Yes, I (feel) wonderful!
You can borrow my Walkman unless you (lose) it.
Have I told you about how Ann (get on) at college?
He (be) intelligent but he (lack) common sense.
The house (be) in good condition but it (need) to be repainted.
He (waste) his time looking for a job there, they (not/ take) any staff on now.
The man who (live) opposite us sometimes (come) over for a cup of coffee.
. If I (have) a headache I generally (take) an aspirin.
In England it always (rain) and the wind constantly
(blow)!
If you (heat) ice, it (melt).

Площадь  треугольника. Формула Герона для площади треугольника. 

Найти значение выражений:  

|-6,7|+|-3,2|;  

|2.73|:|-2,1|;  

|4 2/7|-|-1 5/14|. 

Исследовать и решить в случае совместимости систему уравнений:

x₁+x₂+x₃+x₄=1

2x₁-x₂-2x₃+x₄=-2

x₁-2x₂-3x₃=-3

3x₂+4x₃+x₄=4