Iam working on a test review. how can i write -1 < = 2x+7 < 21 as two inequality statements? how do i join them with and/or? this is for algebra compound inequalities.

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Me. i can't figure out this question. give an explanation too. .

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6