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Yuri [45]
4 years ago
13

le="8 \div (7 - 9) \times (4 + ( - 4))" alt="8 \div (7 - 9) \times (4 + ( - 4))" align="absmiddle" class="latex-formula">
I got the answer -4, but when I typed it in the calculator to check, it said 0. Can anyone help me?
Mathematics
1 answer:
anygoal [31]4 years ago
6 0

8 ÷ (7 - 9) * ( 4 + (-4) ) <--- notice that bolded part.

4 + (-4) = 4 - 4 = 0.

after that, you're pretty much dividing and multiplying by 0, so

whatever ÷ whatever * whatever * 0 = 0.

You might be interested in
A class has an equal number of boys and girls. The boys all got 78% on a test and the girls all got 84%. What are the mean and s
Sergio039 [100]

Answer:

Mean is 81%

standard deviation is approximately 4.2%

Step-by-step explanation:

Since the number of boys equals the number of girls, but it is not given, we name it "N". and proceed to calculate the mean as:

Mean = (0.78 * N + 0.84 * N) /(2 N)

using that the total number of students must be N boys + N girls = 2 N

Then the Mean becomes: N *(0.78 + 0.84) /(2 N) = (0.78 + 0.84) / 2 = 1.62 / 2 = 0.81

So the mean is 81%

Now, standard deviation will be calculated by first adding the squares of the deviations: (X-0.81)^2 for the N boys and for the N girls, and then finding the square root of this and finally dividing by the square root of N. That is:

N\,(0.78-0.81)^2\,+\,N\,(0.84-0.81)^2= N \left \{ (-0.03)^2+(0/03)^2\right \}=N\,*0.0018

Now finding the square root of this value, and finally dividing it by the square root of N:

\sigma=\frac{\sqrt{N\,*\,0.0018} }{\sqrt{N} } =\sqrt{0.0018} \approx 0.042426

which in percent form is: approximately 4.2%

7 0
3 years ago
Dax is buying hot chocolate for 5 people in his office (including himself). He pays for the 5 drinks and leaves a $2.00 tip.
ANEK [815]

Answer: Each cup of hot chocolate is $3.25

Step-by-step explanation:

3 0
3 years ago
A Broadway musical came to town. The auditorium filled all 1,000 seats at two-level pricing. Level 1 tickets are $75 each, and l
aivan3 [116]

Answer:

x represents the number of level 1 tickets; y represents the number of level 2 tickets

Step-by-step explanation:

The first equation (x + y = 1,000 ) shows that x + y equal to the number of seats in the auditorium. That means that they represent the number of tickets. In the second equation (75x + 100y = 25,000) x and y are being multiplied by the cost of their level ticket. So x represents the number of level 1 tickets; y represents the number of level 2 tickets.

hope this helps!

5 0
3 years ago
You sell instruments at a Caribbean music festival. You earn $326 by selling 12 sets of maracas, 6 sets of claves, and xx djembe
ELEN [110]

Answer: An equation we can use to find the number of djembe drums you sold be

12m+6c+dxx=$326

Step-by-step explanation:

Let price of maracas be m

Let the price of claves be c

Let the price of djembe drums be d

Number of maracas = 12 sets

Number of clavas = 6 sets

Number of djembe drums be xx

Total earned amount = $326

According to question,

12m+6c+dxx=$326

Hence, an equation we can use to find the number of djembe drums you sold be

12m+6c+dxx=$326

5 0
3 years ago
Read 2 more answers
What is 4x less than or equal to 12
mihalych1998 [28]
3 x 4 is equal to 12 I think that’s your answer
8 0
2 years ago
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