4(x+15) = 640
4(x) + 4(15) = 640
4x + 60 = 640
4x = 640 - 60
4x =580
x = 580÷4
x = 145
Answer:a
Step-by-step explanation:
It’s an step by step problem
Answer:
growth at the rate of 81% increase.
Step-by-step explanation:
When the base of the exponential function (1.81) is greater than one, it is growth, because with x increasing by one, the value increases by 81% (1.81-1.0)
On the other hand, when the base is less than one, then it decrease at the rate of (1-base). For example, when the base is 0.83, then increasing the value of x DECREASES the value by (1-0.83)= 17%.
Answer:
Step-by-step explanation:
Answer:
6/25 km in 1 min; or 0.24 km/min
Step-by-step explanation:
The info about Angel is not necessary.
Jayden runs 3 laps in 5 mins
Each lap is 2/5 km, so Jayden runs 3 x (2/5 km) in 5 min = 6/5 km in 5 min.
Distance = rate x time
6/5 km = rate (5 min)
We want to isolate r (rate), so divide both sides by 5 min
6/5 km ÷ 5 min = r
6/5 km (1/5 min) = r
6/25 km/min = r (notice how the units worked out correctly to km/min)
So, Jayden runs 6/25 km in 1 min.
