Solve for b. d = 3a + 3b a)b=d−3a b)b=d−3a/3 c)b=3a−d/3 d)b=d−3a/a

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Which of the following parabolas opens down?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air