Question

Down 1. 4(x - 50) = 3x - 95 2. 60 - 2x = 80 - 3x Across 1. 2(x + 2) = 30 1 3. 2(x + 10) = 3 (3x + 80) - 4. 2 2x + 50 x + 175 6. 3 2 5. x2 = 196​

Answer 1

Answer:

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C={x:x is a two-digit natural number such that the sum of its digits is 8}

The elements of this set are 17,26,35,44,53,62,71 and 80 only.

Therefore, this set can be written in roster form as C=17,26,35,44,53,62,71,80.

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Answer 2

Answer:

Generally we add up all the values and then divide by the number of values. In this case, working backwards, we multiply by the number of values (instead of dividing) and then subtract (instead of adding). You should be left with a data value from the set.