What is the equation of this trend line? Enter your answers by filling in the boxes.

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Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Emily convinced her mom to buy a giant box of her favorite cereal. her mom doesn't think the box will fit on their shelf. the volume of the box is 1000 cm^3 . the base of the box is 25 cm by 10 cm