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frutty [35]
3 years ago
8

What is the simplified value of the expression below? 4.2+0.6/3-5(0.9-0.5) will mark the brainliest

Mathematics
2 answers:
Vika [28.1K]3 years ago
7 0

Answer:

2.4 jus did it and it was right

Step-by-step explanation:

makkiz [27]3 years ago
4 0

Hi!

4.2+0.6/3-5(0.9-0.5) = 4.2 + 0.2 - 5*0.4 = 4.4 - 2 = 2.4

Hope this helps!

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A professor has recorded exam grades for 10 students in his​ class, but one of the grades is no longer readable. If the mean sco
Nostrana [21]

Answer:

unreadable score = 35

Step-by-step explanation:

We are trying to find the score of one exam that is no longer readable, let's give that score the name "x". we can also give the addition of the rest of 9 readable s scores the letter "R".

There are two things we know, and for which we are going to create equations containing the unknowns "x", and "R":

1) The mean score of ALL exams (including the unreadable one) is 80

so the equation to represent this statement is:

mean of ALL exams = 80

By writing the mean of ALL scores (as the total of all scores added including "x") we can re-write the equation as:

\frac{R+x}{10} =80

since the mean is the addition of all values divided the total number of exams.

in a similar way we can write what the mean of just the readable exams is:

\frac{R}{9} = 85\\ (notice that this time we don't include the grade x in the addition, and we divide by 9 instead of 10 because only 9 exams are being considered for this mean.

Based on the equation above, we can find what "R" is by multiplying both sides by 9:

\frac{R}{9} = 85\\R=85*9= 765

Therefore we can now use this value of R in the very first equation we created, and solve for "x":

\frac{R+x}{10} =80\\\frac{765+x}{10} =80\\765+x=80*10=800\\765+x=800\\x=800-765=35

4 0
3 years ago
Please help with this math question thanks!!!
melisa1 [442]
The surface area is
A1=7.5*1.5*2=22.5 ft2 top and bottom view
A2=3*1.5*2=9 ft2 laterals view
A3=(7.5*1.5+2.5*1.5)*2=30 ft2  front and rear view

At=22.5+9+30=61.5 ft2
the answer is 61.5 ft2
5 0
3 years ago
Read 2 more answers
The temperature at the south pole was 6 degrees at 8am. At 3 pm it was -18 degrees. By how many degrees did the temperature drop
olga2289 [7]

Answer:

24\°

Step-by-step explanation:

we know that

To determine how many degrees drop the temperature, find out the absolute value of subtract the temperature at 8 am from the temperature at 3 pm.

so

\left|-18-6\right|=24\°

7 0
2 years ago
Best answer get Brainliest. 50 points.
Oliga [24]
<span>The equation would be 5x + 0.10y = 35, and since y equals 100, the 0.10y = 10. Then you get your equation which would be 5x + 10 = 35. and you can use subtraction property of equality and subtract 10 from both sides which gives you 25. So x would equal 5. In this case x represents number of dogs walked. Hope this helps! :D</span>
3 0
2 years ago
Read 2 more answers
Luke earned a salary of 48,048 last year. how much did he earn per month?
viktelen [127]
$4004 just take 48048 and divide that by 12 to get your answer
5 0
3 years ago
Read 2 more answers
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