lorenavh81
20.05.2021 •
Mathematics
Which of the following are solutions to the equation below?
Check all that apply
4x²- 12x + 9 = 5
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Ответ:
A & B
Step-by-step explanation:
4x²- 12x + 9 = 5
4x²- 12x + 4 = 0
devided by 4
x²-3x+1=0
x = (3 ± √9-4)/2 = (3±√5)/2
x = (√5+3)/2 or x= (-√5+3)/2
Ответ:
= 56.7 miles per hour
Step-by-step explanation:
To find the average speed for the entire journey, we need to find the entire distance and the total time
Entire distance = 210 miles + 130 miles = 340 miles
Total time = 3.5 hours and 2.5 hours = 6 hours
Average speed = distance/ time = 340 miles/ 6 hours
= 56.66666666666 miles per hour
Rounding to the nearest tenth
= 56.7 miles per hour