Answer:he spent 1 hour driving at 55 mikes per hour
Step-by-step explanation:
Let x represent the time that Thomas spent driving at 30 miles per hour.
Let y represent the time that Thomas spent driving at 55 miles per hour.
Total time for the trip is 5 hours. This means that
x + y = 5
Distance = speed × time
Distance travelled at 30 miles per hour for x hours = 30×x = 30x miles
Distance travelled at 55 miles per hour for y hours = 55×y = 55y miles
If he traveled a distance of 250 miles, therefore
30x + 55y = 250 - - - - - - -1
Substituting x = 5 - y into equation 1, it becomes
30(5 - y) + 55y = 250
150 - 30y + 55y = 250
- 30y + 55y = 250 - 150
25y = 100
y = 100/25
y = 4
y = 5 - x = 5 - 4
y = 1
Answer:
= 16+49 = 65
Step-by-step explanation:
The error is at the end of the first line. (-7i)(7i) = -49i² ≠ +49i².
The correct work is ...
(4-7i)(4+7i)=16+28i-28i-49i^2
= 16+49
= 65
Answer: 322 m^2
1: 40
2: 10 vertices
3. pentagon
4. 266 cm^2
5. 322 m^2
6. 350pi cm^2
7. 33 ft^2
8. 740 m^2
9. one-point perspective
I know because I am genius trust.
Answer:
4y + 36
Step-by-step explanation:
4 × y = 4y
4 × 9 = 36
4y + 36