Answer:
54.9
Step-by-step explanation:
You always round up if its 0.5 or anything .5
54.58 broken down:
The 5 is the Tens place
The 4 is the Ones place
The 8 is the Tenth place (what the question is asking for)
The 5 is the Hundredths place.
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Answer:
x = 136/35; y = -⁹/₁₀
Step-by-step explanation:
(1) 7x + 8y = 20
(2) 7x – 2y = 29 Subtract (2) from (1)
10y = -9 Divide each side by 10
(3) y = -⁹/₁₀ Substitute (3) into (1)
7x - 2(-⁹/₁₀) = 29
7x + 18/10 = 29 Subtract 18/10 from each side
7x = 29 - 18/10
7x = (290 - 18)/10
7x = 272/10 Divide each side by 7
x = 272/70
x = 136/35
x = 136/35; y = -⁹/₁₀
Check:
(1) 7(136/35) + 8(-⁹/₁₀) = 20
136/5 - 72/10 = 20
136/5 - 36/5 = 20
100/5 = 20
20 = 20
(2) 7(136/35) – 2(-⁹/₁₀) = 29
136/5 + 18/10 = 29
136/5 + ⁹/₅ = 29
145/5 = 29
29 = 29
1) <ABC
2) 120
3) 22
4) <GFH
5) 29
6) 90
7) 45
8) 63
9) 45
10) 110
Part A
The given expression is:
We expand to get:
Note that 
Part Bi)
The given expression is;
We simplify to get:
Note that:
This is now of the form 
, where 
.
This explains why it is a complex number;
Part bii)
The given expression is :
We simplify to get
Part C
We want to simplify:
We rewrite in terms of 
