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jasenka [17]
3 years ago
12

(x2−1)(x+1)≥0. pls help me​

Mathematics
1 answer:
docker41 [41]3 years ago
7 0

Step-by-step explanation:

(x²-1)(x+1)≥0

As it has two multiples,

Therefore,

Either,

x²-1≥0

x²≥0+1

x²≥1

x≤√1

x≤1

Or,

x+1≥0

x≥-1

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Juli2301 [7.4K]

Using a graphing calculator, we can see the graph of the function y = x²-4x+1:

as we can see, the vertex of the function is (2,-3), and the solutions are (0.3,0) and (3.7,0)

4 0
1 year ago
john and jack found a coin on the sidewalk. they argued about whether the coin is fair. john claimed a 40% chance for the coin t
expeople1 [14]

Since it is observed that I z I = 3.464 > 1.96 it is concluded that the null hypothesis is rejected.

Therefore we reject John's claim.

Here:

we can use 1 sample proportion test to check the claim of John

H₀ : p₀ = 0.4

H₁ : p₀ ≠ 0.4

Test statistic is

z = p - p₀/√p₀(1-p₀)n

Let X be the random variable denoting the number of heads.

Now p = X/n

= 8/50

= 0.16

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1-p₀ = 1-0.4

= 0.6

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Learn more about Null hypothesis here:

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6 0
1 year ago
What is the sum of the measures of interior angles for a regular polygon with 5 sides
pshichka [43]

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360 degrees

Step-by-step explanation:

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3 years ago
What amount of money do you have if you have 5 pennies, 13 nickels, 14 dimes, 2 quarters, and one 5 dollar bill?
BartSMP [9]

Answer:

$7.60

Step-by-step explanation:

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  • Nickel = $0.05
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                -<em>The 5 at the end represents the </em><u><em>one</em></u><em> five dollar bill.</em>

Simplified: (solve what is in the parenthesis)

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just olya [345]

Answer:

Find the answers below

Step-by-step explanation:

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Using the SOH CAH TOA identity

sinX = opp/hyp

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For cos X

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Using the SOH CAH TOA identity

sinZ = opp/hyp

sinZ =10/√149

sinZ = 7/√149

For cos Z

cosZ = 7/√149

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2 years ago
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