Can you help me with 3,4,8 and 10, also can you show me in a sheet of paper how you did it?

10. The Family Fine Arts Center charges $25 per adult and $14 per senior citizens for it performances. On a recent weekend evening when 535 people paid admission, the total receipts were $9437. How many who paid were senior citizens? A store has a sale on workout gear. Mark bought three pairs of shorts and three T-shirts for $70.35 [before tax). Later, he went back and bought two more pairs of shorts and four T-shirts for $63.90 [before tax). How much did the each pair of shorts and each T-shirts cost? Solve this system (use any method): x4y=10 2xBy=17 Solve this system [use any method): x+3y=1 3X+9y=3 Solve this system [by hand not calculator}: x+y+z=l xy+3219 5x+y+z=7 A health shop owner made trail mix containing dried fruit, nuts and carob chips. The dried fruit sells for $5.50 per pound, the nuts sell for $7.50 per pound and the carob ships sell for $8.50 per pound. The shop owner mixed 50 pounds of trial mix and sold it for $6.70 per pound. lfthe amount of nut is ve pounds more than the amount of carob chips, how much of each item was used in the trail mix? Sep up the problem {write the equations), then write the augmented matrix and used a calculator to put the matrix into RREF. Then give the answer. Solve this system [by hand not calculator}: x+y+z=0 xy+32214 4x+4y+4z=3 Solve this system of equations using a matrix, show all operations to get to REF, do not use a calculator. X +2y+ 4z= 3 2x+7y+152=12 4x+7y+lBZ=10