Answer:
Step-by-step explanation:
ohn will need to sleep for 10.3 hours before his second exam so that the
he average of his two exam scores is an 80.
We were given
8 hours of sleep = 70
To get an average of 80
70+ x = 80
2
Cross multiply:
70+x = 160
x= 160-70
= 90.
If 8 hours of sleep = 70
x hours of sleep = 90
Cross multiply
8× 90 = 70 × x
720 = 70x
x = 720/70
x = 10.2857
≈ 10.3 hours of sleep
The opposite of 1/3 = -1/3
the opposite of -7/12 = 7/12
Answer:
it means that his equation is not true.
Step-by-step explanation:
-2=2 is obviously incorrect, so we must assume that the equation isn't true.
19. x^2+16x+64
=(x+8)^2
21. x^2-10x+25
=(x-5)^2
Answer:
Step-by-step explanation:
Each question has 4 options with only one correct answer and all other incorrect answers. Student is equally likely to pick any outcome in any given question. Hence, probability of choosing correct answer is 1/4 = 0.25
mark this as brainly pls.....
