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3 years ago

-(6)^-1 Can somebody solve this? Is it correct if the answer is 6? Please help me!

Mathematics

1 answer:

Paladinen [302]3 years ago

3 0

-(6)^-1
We can write it as:
-6^-1
As a^-1=1/a
-6^-1= - 1/6

Answer: - 1/6

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A dart is to be thrown at a target. The probability the dart will hit the target (yes or no) on a single attempt is 0.20. Each t

MArishka [77]

Answer:

0.04

Step-by-step explanation:

Given that a dart is to be thrown at a target. The probability the dart will hit the target (yes or no) on a single attempt is 0.20

Each throw is independent of the other throws.

Let x be the no of times the target is hit in the trial of 4 throws

Since each outcome is independent of the other X is binomial with n =4 and p = 0.20

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= the probability that it will take less than or equal to 4 throws to hit the target on both successful target hits

=P(X=2 when n =2) + P(x=2 when x =3) + P(x=2 when x =4)

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3 years ago

You earned a 90% on a science test. You answered 18 questions correctly. How many questions were on the test?

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This is an easy one!

Answer = 20.

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So, 20 questions!

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3 years ago

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The amount of time it takes p people to paint d doors varies directly with the number of doors and inversely with the number of

yanalaym [24]

Answer:

4 people

Step-by-step explanation:

This problem is a compound rule of three problem. The variables are:

number of people, number of doors, amount of time

the amount of time increases if the number of doors decreases, but the amount of time decreases if the number of people increases.

We can solve this problem by parts (using two simple rule of three):

4 people can paint 10 doors in 2 hours

Let's first find how many people would take to paint 25 doors in 2 hours (we make the amount of hours constant, so the rule of three is between number of people and number of doors):

4 people -> 10 doors -> 2 hours

X people -> 25 doors -> 2 hours

4/X = 10/25

X = 25*4/10 = 100/10 = 10

It would take 10 people to paint 25 doors in 2 hours.

Now, we make a inverse rule of three between the number of people and amount of time:

10 people paint 25 doors in 2 hours, how many people paint 25 doors in 5 hours:

10 people -> 25 doors -> 2 hours

X people -> 25 doors -> 5 hours

10*2 = X*5

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3 years ago

What is the focus of the parabola? y=−1/4x^2−x+3

Delvig [45]

We know that
the equation of the parabola is of the form
y=ax²+bx+c

in this problem
y=−1/4x²<span>−x+3
where
a=-1/4
b=-1
c=3

</span><span> the coordinates of the focus are
</span>
(-b/2a,(1-D)/4a)
where
D is the discriminant b²-4ac
D=(-1)²-4*(-1/4)*3-----> D=1+3---> D=4
therefore
x coordinate of the focus
-b/2a----> 1/[2*(-1/4)]----> -2

y coordinate of the focus
(1-D)/4a------> (1-4)/(-4/4)---> 3

the coordinates of the focus are
(-2,3)

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