21: stan bought a monster truck for $2,000 down and payments of $450 a month for five years. what's the total cost of the monster truck?

The total cost of the monster truck = 29000 $

Step-by-step explanation:

Stan bought a monster truck for $2,000 down and payments of $450 a month for five years.

Initial payment = 2000 $

Monthly payment = 450 $

Number of years paid = 5

Number of months in 5 years = 12 x 5 = 60

Total amount paid = 2000 + 60 x 450 = 29000 $

The total cost of the monster truck = 29000 $

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.