Which options could be the next step in simplifying this expression?
15 + (5 + 21)
choose exactly two answers that are correct.
a.
36 + 20 (use the commutative property)
b.
15 + 26 (use order of operations)
c.
20 + 36 (use the distributive property)
d.
20 + 21 (use the associative property)

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?