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3 years ago

-4-5+4+ (-5)−4−5+4+(−5} What the answer ?

Mathematics

2 answers:

lyudmila [28]3 years ago

6 0

Answer = -20
-4-5+4+(-5)-4-5+4+(-5) =-20

Shkiper50 [21]3 years ago

6 0

Answer:

-20

Step-by-step explanation:

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A recent survey found that 70% of all adults over 50 wear

lubasha [3.4K]

Answer:

There is an 84.97% probability that at least six wear glasses.

Step-by-step explanation:

For each adult over 50, there are only two possible outcomes. Either they wear glasses, or they do not. This means that we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinatios of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

In this problem we have that:

$n = 10, p = 0.7$

What is the probability that at least six wear glasses?

$P(X \geq 6) = P(X = 6) + `P(X = 7) + P(X = 8) + P(X = 9) + P(X = 10) = 0.8497$

There is an 84.97% probability that at least six wear glasses.

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3 years ago

Which pairs of angles are supplementary? A) ∠BCD and ∠BAD B) ∠BCD and ∠ABC C) ∠BCD and ∠CDA D) ∠ABC and ∠BAD

Bogdan [553]

<span>∠ABC ∠BAD is the correct answer

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3 years ago

Use the identity x^3+y^3+z^3−3xyz=(x+y+z)(x^2+y^2+z^2−xy−yz−zx) to determine the value of the sum of three integers given:

RoseWind [281]

Inserting all the given information into the identity, we have

$684-3(210)=(x+y+z)(110-107)\implies x+y+z=18$

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3 years ago

Help ASAP I’ll mark you as brainlister PLEASE!!’

Alex17521 [72]

Answer:

A = 76.8 yd²

Step-by-step explanation:

The area (A) of a regular polygon is calculated as

A = $\frac{1}{2}$ pa ( p is the perimeter and a the apothem )

Here p = 8 × 4 = 32 yd and a = 4.8 yd , then

A = $\frac{1}{2}$ × 32 × 4.8 = 16 × 4.8 = 76.8 yd²

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3 years ago

A gardener uses 1\3 of liter of water to water 2\7 of the garden

andrew11 [14]

The answer is 13 because you add.

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3 years ago