Assistance with question 4 and 5

Mathematics
Tutor: None Selected Time limit: 1 Day

Question 4

Simplify by combining like terms:

1/5 a + 1/2 - 7/2 + 9/5 a

Question 5

Evaluate

4 + 6x

if x= -7

Oct 31st, 2014

1).

1/5 a + 1/2 - 7/2 + 9/5 a

= 1/5 a + 9/5 a + 1/2 - 7/2

= a/5 + 9a/5 + 1/2 - 7/2

L.C.M is 5 and 2, then

= (a + 9a)/5 + (1 - 7)/2

= 10a/5 + (- 6)/2

= 2a - 6/2

= 2a - 3

2).

x= -7

4 + 6x

Now putting the values, we get

= 4 + 6(-7)

= 4 - 42

= - 38

Oct 31st, 2014

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