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anyanavicka [17]
3 years ago
10

(10 POINTS AND BRAINLIEST FOR BEST)

Mathematics
2 answers:
Lana71 [14]3 years ago
8 0

Answer:

+4-7=-3 is the answer mate

Ira Lisetskai [31]3 years ago
6 0

Answer:

4 - 7 = -3

Step-by-step explanation:

A number sentence is a mathematical sentence, made up of numbers and signs. Therefore the number sentence to represent the model is: 4 - 7 = -3  because there are 4 positive charges and 7 negative charges, which make a 3 negative net charge

You might be interested in
For which values of x is the expression undefined? x+1/x-6
Morgarella [4.7K]

Answer:

x=6

Step-by-step explanation:

x+1

-------

x-6

The expression is undefined when the denominator is zero

x-6 =0

Solving for x

x+6-6 =0+6

x=6

4 0
2 years ago
Which of the following expressions are equivalent to - -8/-4
ExtremeBDS [4]

Hey there!

-8/-4

= 8/4

= -8 ÷ -4

= 8 ÷ 4

= 2


Therefore, your answer is:

Option B. 2


Good luck on your assignment & enjoy your day!


~Amphitrite1040:)

8 0
2 years ago
A taxi travels 25 kilometers east of an airport. Then it travels from that point to a point that is 40 kilometers west of the ai
kati45 [8]
25km east + 25km return+  40km west + 40km return = 130km

Hope that helped :)
7 0
3 years ago
I need help with this please
Helen [10]

So burger king offers 10 chicken nuggets for $1.49

   1 chicken nugget = price for 10 chicken nugget / 10 chicken nugget

                         = $1.49 / 10 = $0.15 per nugget (approximated)

Hope that helps!

8 0
2 years ago
HELP PLEASE!!! I need help with 94 if you could show the steps that would be very helpful!
aksik [14]
A combination is an unordered arrangement of r distinct objects in a set of n objects. To find the number of permutations, we use the following equation:

n!/((n-r)!r!)

In this case, there could be 0, 1, 2, 3, 4, or all 5 cards discarded. There is only one possible combination each for 0 or 5 cards being discarded (either none of them or all of them). We will be the above equation to find the number of combination s for 1, 2, 3, and 4 discarded cards.

5!/((5-1)!1!) = 5!/(4!*1!) = (5*4*3*2*1)/(4*3*2*1*1) = 5

5!/((5-2)!2!) = 5!/(3!2!) = (5*4*3*2*1)/(3*2*1*2*1) = 10

5!/((5-3)!3!) = 5!/(2!3!) = (5*4*3*2*1)/(2*1*3*2*1) = 10

5!/((5-4)!4!) = 5!/(1!4!) = (5*4*3*2*1)/(1*4*3*2*1) = 5

Notice that discarding 1 or discarding 4 have the same number of combinations, as do discarding 2 or 3. This is being they are inverses of each other. That is, if we discard 2 cards there will be 3 left, or if we discard 3 there will be 2 left.

Now we add together the combinations

1 + 5 + 10 + 10 + 5 + 1 = 32 choices combinations to discard.

The answer is 32.

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

Note: There is also an equation for permutations which is:

n!/(n-r)!

Notice it is very similar to combinations. The only difference is that a permutation is an ORDERED arrangement while a combination is UNORDERED.

We used combinations rather than permutations because the order of the cards does not matter in this case. For example, we could discard the ace of spades followed by the jack of diamonds, or we could discard the jack or diamonds followed by the ace of spades. These two instances are the same combination of cards but a different permutation. We do not care about the order.

I hope this helps! If you have any questions, let me know :)








7 0
3 years ago
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