Simplify the following expression. (64x+67y) + (-29x+44y)

A. 35x + 23y
B. 93x + 23y
C. 93x + 111y
D. 35x + 111y

Help please

What are “like terms”? why can we only add like terms?

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left