19 tenths plus 11 tenths

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)