If a, b, c, and dare numbers on the number line shown and if the tick marks are equally spaced, what is the value of a + c ?
(1) $$a+b=-8$$
(2) $$a+ d= 0$$
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If a, b, c, and dare numbers on the number line shown and if the tick marks are equally spaced, what is the value of a + c ?
(1) $$a+b=-8$$
(2) $$a+ d= 0$$
正确答案: C