What is the median of this data set ? 21,42,63,84,105,126,147

a.21
b.63
c.84
d.126​

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

The oates family went out for dinner the price of the meal was $33.95 the sales tax was 7.25% of the price of the meal . the tip was 15% of the meal and the sales tax . how much money did the oates family pay for the meal, including tax and tip