1A

1. a=5 d=3 47^th term = 143

2. a=6 d=11 47^th term = 3036

3. a=7 d=7 47^th term = 329

4. a=50 d=-4 47^th term = -134

5. a=-13 d=5 47^th term = 217

6. a=-4 d=-6 47^th term =-280

1C

1.

2.

3.

4.

5.

1D

1. Use S₁₀-S₅

You should get 285

2.

So any pair of numbers that satisfy this equation

will be suitable solutions

eg. a=4.4 d=1

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