Combine the following expressions.
%20-%20c%20%5Csqrt%7Bx%7D%20" id="TexFormula1" title="a \sqrt{x} + b \sqrt{y} - c \sqrt{x} " alt="a \sqrt{x} + b \sqrt{y} - c \sqrt{x} " align="absmiddle" class="latex-formula">
1 answer:
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Answer:
B
Step-by-step explanation:
Note the common difference between consecutive terms of the sequence.
d = 16 - 12 = 20 - 16 = 4
This indicates the sequence is arithmetic with sum to n terms
=
[2a₁ + (n - 1)d ]
where a₁ is the first term and d the common difference
Here a₁ = 12 and d = 4, thus
=
[ (2 × 12) + (41 × 4) ]
= 21( 24 + 164) = 21 × 188 = 3948 → B