$60 -$45= $15
$15/ $60* 100%= 25%
The percent discount is 25%~
Answer:
9,8,1,0,-10,-15
Step-by-step explanation:
HOPEE HELPSS HEHE
Alright, so we'd use the combinations with repetition formula, so we choose from 4 schools to distribute to and distribute 8 blackboards. It's then
( 8+4-1)!/8!(4-1)!=11!/(3!*8!)=165
For at least one blackboard, we first distribute 1 to each school and then have 4 blackboards left, getting (4+4-1)!/4!(4-1)!=7!/(4!*3!)=35
