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2 years ago

(4₊√₋81)₋(9₊√₋9) i cant resolve this equation. thanks for help

Mathematics

2 answers:

bezimeni [28]2 years ago

8 0

The question can't be solved because we can't have negative sign under square root

gulaghasi [49]2 years ago

3 0

Answer:

-5 +6i

Step-by-step explanation:

Square roots of negative numbers are imaginary. This is asking for the difference of two complex numbers. A suitable calculator can show you what that is.

<h3>simplify radicals</h3>

We know that √(-1) ≜ i. This means the radicals can be simplified to ...

$\sqrt{-81}=\sqrt{9^2(-1)}=9\sqrt{-1}=9i\\\\\sqrt{-9}=\sqrt{3^2(-1)}=3\sqrt{-1}=3i$

So the expression becomes ...

(4 +9i) -(9 +3i)

<h3>combine terms</h3>

Like terms can be combined in the usual way. For the purpose here, i can be treated as though it were a variable.

(4 +9i) -(9 +3i) = 4 +9i -9 -3i

= (4 -9) +(9 -3)i

= -5 +6i

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Before 1918, approximately 40% of the wolves in a region were male, and 60% were female. However, cattle ranchers in this area h

Goshia [24]

Answer:

P(≥ 7 males) = 0.0548

Step-by-step explanation:

This is a binomial probability distribution problem.

We are told that Before 1918;

P(male) = 40% = 0.4

P(female) = 60% = 0.6

n = 10

Thus;probability that 7 or more were male is;

P(≥ 7 males) = P(7) + P(8) + P(9) + P(10)

Now, binomial probability formula is;

P(x) = [n!/((n - x)! × x!)] × p^(x) × q^(n - x)

Now, p = 0.4 and q = 0.6.

Also, n = 10

Thus;

P(7) = [10!/((10 - 7)! × 7!)] × 0.4^(7) × 0.6^(10 - 7)

P(7) = 0.0425

P(8) = [10!/((10 - 8)! × 8!)] × 0.4^(8) × 0.6^(10 - 8)

P(8) = 0.0106

P(9) = [10!/((10 - 9)! × 9!)] × 0.4^(9) × 0.6^(10 - 9)

P(9) = 0.0016

P(10) = [10!/((10 - 10)! × 10!)] × 0.4^(10) × 0.6^(10 - 10)

P(10) = 0.0001

Thus;

P(≥ 7 males) = 0.0425 + 0.0106 + 0.0016 + 0.0001 = 0.0548

3 0

2 years ago

I'm confused, please help. :/

vampirchik [111]

uh i did this wrong so uh just ignore what i said

5 0

2 years ago

Read 2 more answers

What is the inverse of function F f(x) 3-x/7

algol [13]

Answer: f^-1(x)=-7x+3 maybe ? i think

Step-by-step explanation:

8 0

2 years ago

X + 5 ≤ 13 what's the answer for this question?

wariber [46]

Answer:

Inequality Form: x ≤ 8

Interval Notation: (-∞,8]

Step-by-step explanation:

x + 5 ≤ 13

Subtract 5 on both sides...

13 - 5 = 8

You're left with x ≤ 8

Inequality Form: x ≤ 8

Interval Notation: (-∞,8]

6 0

3 years ago

HALP MEEEEEEEEEEEEEEE

nevsk [136]

Answer:

-1, 9, - 21, 69

Step-by-step explanation:

<u>Given recursive formula:</u>

a₁ = -1
aₙ = - 3aₙ₋₁ + 6 for n ≥ 2

<u>The first 4 terms are:</u>

a₁ = - 1, given
a₂ = - 3*(-1) + 6 = 3 + 6 = 9
a₃ = - 3*(9) + 6 = - 27 + 6 = - 21
a₄ = - 3*(-21) + 6 = 63 + 6 = 69

6 0

2 years ago