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Alenkinab [10]
2 years ago
9

Which number is rational? HELP QUICK PLEASE

Mathematics
2 answers:
Nataly_w [17]2 years ago
6 0

Answer:

49

Step-by-step explanation:

REY [17]2 years ago
4 0
The first one. The square root of 49 is seven. And then when you have your negative number it makes it positive. So your answer is A.
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Erry has taken a random sample of students and determined the number of electives that each student in his sample took last year
Cerrena [4.2K]
The mean should be about the same, because the sample is random
6 0
3 years ago
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What is the area of polygon XYZ?
Alex_Xolod [135]

Answer:

B. 36 square units

Step-by-step explanation:

This is a triangle and to calculate the area of a triangle we multiply height with base and that divided by two

The height of this triangle is 8 units and the base is 9 units

9 × 8 ÷ 2 = 36 square units

6 0
3 years ago
(HELP PLEASEE) The area of a rectangular swimming pool is 2x^2+13x-7. Find the dimensions of the swimming pool.
bearhunter [10]

Answer:

length =

2x - 1

width =

x + 7

Step-by-step explanation:

here we go,

=》

2x {}^{2}  + 13x - 7

=》

2 {x}^{2}  + 14x - x - 7

=》

2x(x + 7) - 1(x + 7)

=》

(2x - 1)(x + 7)

here, we got

the dimensions as :-

(2x - 1) \:  \: and \:  \: (x + 7)

7 0
3 years ago
What is each power of i with its multiplicative inverse.
pentagon [3]

Answer:

1) multiplicative inverse of i = -i

2) Multiplicative inverse of i^2 = -1

3) Multiplicative inverse of i^3 = i

4) Multiplicative inverse of i^4 = 1

Step-by-step explanation:

We have to find multiplicative inverse of each of the following.

1) i

The multiplicative inverse is 1/i

if i is in the denominator we find their conjugate

=1/i * i/i\\=i/i^2\\=We\,\, know\,\, that\,\, i^2 = -1\\=i/(-1)\\= -i

So, multiplicative inverse of i = -i

2) i^2

The multiplicative inverse is 1/i^2

We know that i^2 = -1

1/-1 = -1

so, Multiplicative inverse of i^2 = -1

3) i^3

The multiplicative inverse is 1/i^3

We know that i^2 = -1

and i^3 = i.i^2

1/i^3\\=1/i.i^2 \\=1/i(-1)\\=-1/i * i/i\\=-i/i^2\\= -i/-1\\= i

so, Multiplicative inverse of i^3 = i

4) i^4

The multiplicative inverse is 1/i^4

We know that i^2 = -1

and i^4 = i^2.i^2

=1/i^2.i^2\\=1/(-1)(-1)\\=1/1\\=1

so, Multiplicative inverse of i^4 = 1

3 0
3 years ago
Jane needs to miss fewer than 1/6 of the words on her spelling list.  If there are 18 words, how many can she miss?  Explain.
rjkz [21]
She would have to miss 1 or 2 because 1/6 of 18 is 3 so less than 3 is 2 or 1

hope that helps!
3 0
3 years ago
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