Question

15 less than twice a number is less than or equal to -23

Answer 1

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ʟᴇᴛ ᴛʜᴇ ʀᴇǫᴜɪʀᴇᴅ ɴᴜᴍʙᴇʀ ʙᴇ x.

ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ ᴛʜᴇ ǫᴜᴇsᴛɪᴏɴ,

2x - 15 ≤ -23

=> 2x ≤ -23 + 15

=> 2x ≤ -8

=> x ≤ -4

∴ x ∈ (-∞, -4]