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jenyasd209 [6]
3 years ago
6

What does -8+(-12) / (-4) equal too?

Mathematics
2 answers:
zalisa [80]3 years ago
5 0

Answer:

5

Step-by-step explanation:

1. Add -8 to -12. This equals -20.

2. Now you have -20/(-4)

3. Solve this by dividing -20 and -4.

4. Two negatives make a positive, so your answer would be 5.

Hope this helps

soldi70 [24.7K]3 years ago
3 0
[Positive 5 or negative 5 depending on if your using PEMDAS]
-5 if your doing PEMDAS
Cuz You do division first -12/-4=3 Cuz a negative divided by a negative is positive
Then add 3 to -8 and that’s -5 since the 8 is negative and the three is positive we’re subtracting 3 from -8

But if your NOT doing PEMDAS then the answer is a positive 5
[-8+ (-12)= -20/-4= 5]
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If it takes you 40 minutes to go 20 miles downstream and then 60 minutes on the way back, what is the speed of the current?
IrinaK [193]

Answer:

Speed of Current = 5 miles per hour

Step-by-step explanation:

We know distance formula,

D = RT

Where

D is distance

R is rate

T is time

If we let speed of boat (assume) to be "x" and speed of current to be "c"

Then downstream rate is (with current) = x + c

Upstream rate is (against current) = x - c

40 mins to go 20 miles downstream, that means:

D = RT

20 = (x + c)(40)

and

60 minutes to go upstream, 20 miles, that means:

D = RT

20 = (x - c)(60)

Simplifying first equation:

40x + 40c = 20

Simplifying second equation:

60x - 60c = 20

Multiplying first equation by 60, we get:

60 * [40x + 40c = 20] = 2400x + 2400c = 1200

Multiplying second equation by 40, we get:

40 * [60x - 60c = 20] = 2400x - 2400c = 800

Now we add up both these equations:

2400x + 2400c = 1200

2400x - 2400c = 800

----------------------------------

4800x = 2000

x = 2000/4800 = 5/12

We need speed of current, that is "c", so we plug in the value of x into first equation and solve for c:

40x + 40c = 20\\40(\frac{5}{12}) + 40c = 20\\\frac{50}{3}+40c=20\\40c=20-\frac{50}{3}\\40c=\frac{10}{3}\\c=\frac{1}{12}

Speed of Current = 1/12 miles per minute

Since there is 60 minutes in an hours, that would be:

(1/12) * 60 = 5 miles per hour

Speed of Current = 5 miles per hour

3 0
3 years ago
Explain how to verify that 3(2x + 5) = 9 + 3x and x = –2 are equivalent equations.
aniked [119]

3 times (2x + 5) is 6x + 15.

6x + 15 = 9 + 3x.

Group by like terms. 6 = -3x

Divide to get x by itself. 6/-3 = -2

Thus -2 = x

6 0
3 years ago
Mark buys last year's best-selling novel, in hardcover, for $23.20. This is with a 20% discount from the original price. What wa
Gelneren [198K]

Answer:

29

Step-by-step explanation:

Let x be the original price.

( 1 - 20% ) x = 23.2

0.8x = 23.2

\frac{0.8x}{0.8}  =  \frac{23.2}{0.8}

x = 29

8 0
3 years ago
When you multiply 2/3 by a fraction less than one, how does the product compare to the factor
user100 [1]
The product is less than either of the factors. Multiplying a number < 1 with 2/3 another number < 1, will give a fraction of a fraction, and part of a fraction is an even smaller fraction. Another way of looking at it: Fractions less than one have numerators smaller than their denominators. When multiplying fractions, you multiply across, so multiplying two fractions that are both less than one will always give a numerator much smaller than the denominator, and a larger denominator makes for a smaller number. I hope this helps, but if you have questions, ask.
3 0
3 years ago
Whats the answer to 5x5
OverLord2011 [107]

Answer:

your mom

Step-by-step explanation:

Your next 5 days will be like this:

Day 1 - you will wake up to the biggest shock of your life. Day 2 - you will cross paths with an old friend you have missed. Day 3 - you will find yourself with a lot of money. Day 4 - your day will be perfect. Day 5 - the person u like the most in your life will spend lots of time with you. If you don’t forward this, your next 5 days will be the exact

8 0
2 years ago
Read 2 more answers
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