I haven't touched on mean, mode, medium, and range in a little while so I could be wrong, but if (mean) means average, i think average is adding 2 grades together then dividing the number of exams, so the average needs to be 90, so what I did was i found the difference between the original grade on the first exam, so 90-86=4, so i guessed at 94 being the next grade needed. (86+94)/2=90. 86+94=180 then divide 180 by 2 and it equals 90. so yeah your answer is 94.
Answer:
The temperature at 5 am is 16 degrees below zero.
Step-by-step explanation:
The temperature at 2 am is 9 degrees below zero:

Since at 5 am the temperature had dropped by an additional 7 degrees, we have:

Therefore, the temperature at 5 am is 16 degrees below zero.
I hope it helps you!
Answer:
X = 9 or 1/3
Step-by-step explanation:
Explanation given in attachment in order to well articulate the logarithm sign.
Note addition in logarithm means multiplication.
The logarithm of a number the same as the base is 1.
HCF is 7 do you need explanation
The answer is subtract two from both sides. Explanation: because it males the equation even and easier to solve.