Answer:
Step-by-step explanation:
Let the speed of the car is c and speed of the plane is p.
<h3>We are given:</h3>
The speed of the plane is 7 times the speed of the car
The distance traveled is
The time difference to travel this same distance is 3 hours.
<h3>We know that:</h3>
- d = ts, where d- distance, t- time, s - speed
Find the time for car and plane and their difference.
<h3>Car</h3>
<h3 /><h3>Plane</h3>
- t = d/s = 315/p = 315/(7c) = 35/c
<h3 /><h3>The difference</h3>
<u>Solve it for c:</u>
- (315 - 45)/c = 3
- 270/c = 3
- c = 270/3
- c = 90 km/h
Now find the speed of plane:
As we see, Jenny is right
<span>B. ∠1 and ∠9</span>
........................
The answer is 4/7, because if A to P is 3/7 of the way, going to B would be to the end. So, you have to go 4/7 of the way to get to the end.
Answer:
False
Step-by-step explanation:
Rewrite equation:
f(x)=1+x
Substitute X for 1:
f(1)=1+1
Combine like terms:
f(1)=2
the equation equals 2 not 0 so it is false
To find the roots, we need to factorize the quadratic expression
x² + 6x - 55 = 0
x² + 11x - 5x - 55 = 0
x(x + 11) - 5x - 55 = 0
x(x + 11) -5 (x + 11) = 0
(x - 5)(x + 11) = 0
Then solve the value of x
x - 5 = 0
x = 5
or
x + 11 = 0
x = -11
The roots are -11 and 5
Sum of the roots
sum = -11 + 5
sum = -6
The answer is option b