Answer:
($4.30 × 3)(3c) = $19.50
c = $2.20
Step-by-step explanation:
($4.30 × 3)(3c) = $19.50
(12.90)(3c) = 19.50
3c = 6.60
c = 2.20
(u had most of the equation laid out already, u were just missing 3c)
To find the speed of the boats we will divide the distance by time.
From the graph we finde the boats' speeds as ;

And for the speed of the third boat, we will also divide the distance by time.

As you can see the speed of boat 3 (8 km/h) is more than boat 1 (7 km/h) and boat 2 (5 km/h).
Thus the third boat is faster than both of them.
The answer is B.
You can see the speed of boat 1 and 2 in the picture.
Answer:
x=12
Step-by-step explanation:
Decibel is directly proportional to number of cars passing the point. That is,
69 db ----- 139 cars
x db ----- 17 cars
x = number of cars passing the point per minute on a weekend.
Then,
x= (69*17)/139 = 8.43 db ≈ 8 db
3x -4 (5 - x) = 7x -20
3x-20+4x=7x-20
7x-20=7x-20