Tengo (3×-2y) soles ahorrados trabaje una semana y octube (5×+7y) el fin de semana gaste (5y) soles con cuanto soles me quede?

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?