Maya's bank account has $55. She wrote a check for $42. Which expression represents this situation ?

a) 55-42
b) (-42)-55
c) 55+42
d)42-55

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y

The temperature at dawn was -2°f. during the day, the temperature increased 15 degrees, and then dropped 10 degrees in the evening. which expression represents the new temperature?