Write and evaluate the expression. Then, select the correct answer.

a number squared decreased by six

evaluate when c = 7

A 2-column table with 4 rows. Column 1 is labeled Key words with entries a number, squared, decreased by, six. Column 2 is labeled Replace with entries c, exponent is 2, minus, 6.

2c – 6; when c = 7, the value is 8.
c2-6; when c = 7, the value is 8
c2-6; when c = 7, the value is 43
2c+6; when c = 7, the value is 20