49^3/8
decimal form: 4.30351707
Let
x--------> Peter's drive speed on the highway in mph
y--------> Peter's drive speed on country roads in mph
we know that
x=25+y-------> equation 1
70/y=120/x------> 70*x=120*y-----> x=120*y/70------> equation 2
remember that
time=distance/speed
equate equation 1 and equation 2
25+y=120*y/70-----> multiply by 70 both sides
70*[25+y]=120*y-----> 1,750+70*y=120*y-----> 50*y=1,750------> y=35 mph
x=25+35------> x=60 mph
the answer is
Peter's drive speed on the highway is 60 mph
Peter's drive speed on country roads is 35 mph
Answer:
- x² + 11x - 28
Step-by-step explanation:
y = - (x - 4)(x - 7) ← expand factors using FOIL
= - (x² - 11x + 28) ← distribute parenthesis by - 1
y = - x² + 11x - 28 ← in standard form
Let's change all of them into seconds so it is easier to compare:
Pamela: 51 seconds.
Lucy: 3/5 minute x 60 = 36 seconds
Kady: 8 minutes x 60 = 480 seconds
Thus, Kady can stay underwater the longest.
Answer:
65°
Step-by-step explanation:
x=180°-40°-75°
x=65°