& if y varies directly as x and y = 12 when x = 4 find y when x = 12​

Identify the conclusion of the conditional statement. if you live in phoenix, then you live in arizona.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.