SOLVE THIS SIMPLIFICATION QUESTIONS

1.If a2−b2=21 and a2+b2=29 then what is the value of ab?
A.10
B.9
C.2
C.5

2.7^x=49^x WHAT IS x?

A.2

B.1

C.0

D.1/2

3.Simplfy b - [b -(a+b) - {b - (b - a+b)} + 2a]

1. a
2. 2a
3. 4a
4. o

4.100 + 50 * 2 = ?

1. 200
2. 150
3. 100
4. 300

5. (3080 + 6160) / 28

1. 380
2. 350
3. 330
4. 310

6. 5004 / 139 - 6

1. 25
2. 27
3. 29
4. 30

7. 7500 + (1250 / 50)

1. 7500
2. 7525
3. 7550
4. 8000

8. Simplify (31/10) * (3/10) + (7/5) / 20

1. 0
2. 1
3. 10
4. 100

9.If a = 1 + √3 and b = 1 - √3, what is the value of (a2 + b2)?

A. 6

B. 8

C. 10

D. 12 

10.If x^y=512 and y^x=81 then what is x*(x+y)?

A.21

B.22

C.24

D.18

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