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navik [9.2K]
3 years ago
8

Perform the operation. (4x^2+9x-7)-(-7x^2+5x-1)

Mathematics
2 answers:
nataly862011 [7]3 years ago
7 0

Answer:

11x^2+4x-6

Step-by-step explanation:

4x^2+9x-7+7x^2-5x+1\\\\simplify: 11x^2+4x-6

viva [34]3 years ago
3 0

(4 {x}^{2}  + 9x - 7) - ( - 7 {x}^{2}  + 5x - 1) \\  = (11 {x}^{2}  + 4x - 6)

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Vsevolod [243]

Answer:

the answer is 8

because 24 divided by 3 is 8

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A parking lot charges $2 per hour for the first 4 hours
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Where's the rest of the question?
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Question and answer choices in the attachment
Elden [556K]
<h3>You have the correct answer. It is choice C) additive inverse.</h3>

The additive inverse is the idea of adding a negative number, which is the same as subtraction. Example: 2 + (-3) = 2-3

Based on the example above, if we start off with 3 and add on its additive inverse -3, then 3 + (-3) = 3-3 = 0. In general, x + (-x) = x-x = 0. So adding any number with its additive inverse gets you 0 every time.

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

Extra info:

  • Choice A is ruled out because the commutative property of multiplication is the idea that we can multiply two numbers in any order we want. Eg: 7*8 = 56 and 8*7 = 56, so 7*8 = 8*7
  • Choice B is ruled out as well. The commutative property of addition is similar to the rule mentioned in choice A. But now we're adding. This rule says we can add two numbers in any order. Eg: 4+5 = 5+4 = 9
  • Choice D is ruled out also. The multiplicative inverse of x is 1/x. Multiplying the two together gets you 1. Keep in mind that x cannot be zero. Example: The multiplicative inverse of 99 is 1/99, since 99*(1/99) = 99/99 = 1.
4 0
3 years ago
10. There are nine golf balls numbered from 1 to 9 in a bag. Three balls are randomly selected without replacement to form a 3-d
lbvjy [14]

Answer:

a) 504

b) 56

c) 0.111

Step-by-step explanation:

Data provided in the question:

There are nine golf balls numbered from 1 to 9 in a bag

Three balls are randomly selected without replacement

a) 3-digit numbers that can be formed

= ^nP_r

n = 9

r = 3

= ⁹P₃

= \frac{9!}{9!-3!}

= 9 × 8 × 7

= 504

b)  3-digit numbers start with the digit 1

=  _ _ _

in the above 3 blanks first digit is fixed i.e 1

we and we have 8 choices left for the last 2 digits

Thus,

n = 8

r = 2

Therefore,

= 1 × ⁸P₂

= 1 × \frac{8!}{8!-2!}

= 1 × 8 × 7

= 56

c) Probability that the 3-digit number formed is less than 200

Now,

The number of 3-digit number formed is less than 200 will be the 3-digit numbers start with the digit 1 i.e part b)

and total 3-digit numbers that can be formed is part a)

therefore,

Probability that the 3-digit number formed is less than 200

= 56 ÷ 504

= 0.111

5 0
4 years ago
What is the fourth row of Pascal’s triangle?
Anna [14]

Answer:

14641

Step-by-step explanation:

formular \: for \: the \: digits \: in \: each \\ row \: of \: a \: pascal \: triangle \: is \:  = 11 {}^{n}  \\ row \: 0 =  \: 11 {}^{0}  = 1 \:  \\ row \: 1 \:  = 11 {}^{1}  = 11 \\ row \:  \: 2 \:  = 11 {}^{2}  = 121 \\ row \: 3 =  \: 11 {}^{3}  = 1331  \\ row \: 4 = 11 {}^{4}  = 14641 \\ therefore \: the \: fourth \: row \: is \: 14641

4 0
2 years ago
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