If 2d = 5c, then all of the following are true except

Mp model with mathematics explain how the number of text messages dario sent and the cost form an arithmetic sequence.then write an expression to find dario's text messaging bill if he sends n text messages over 250.

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Arational number that is equivalent to -20/4?