All categories

3 years ago

Evaluate -2x2 y, if x = -3 and y = -1

Mathematics

1 answer:

Gre4nikov [31]3 years ago

6 0

The answer is -12
these are the steps on how to find that
-2x2y
-2(-3)2(y)
6 times -2
-12

You might be interested in

State what additional information is required in order to know what the triangles are congruent by SSS

SSSSS [86.1K]

SSS is 3 sides, you already know EF and DW are identical and the two triangles share side DF, so you would need to know that ED ≅ WF

5 0

3 years ago

Please answer 14 and 15 please!

alexandr402 [8]

Answer: number 14 is 30.78 x 10 to the exponent of 11

Step-by-step explanation:

you multiply 8.1 and 3.8 together which would equal 30.78 and you add the exponents together since they are being multiplied.

8 0

3 years ago

8. Shenea bought 3 bottles of juice for $12. Write the rate as a

slamgirl [31]

Answer:

Each bottle is $4

Step-by-step explanation:

12/3

8 0

3 years ago

In Leakwater township, there are two plumbers. On a particular day three Leakwater residents call village plumbers independently

Marianna [84]

Answer:

25% probability that all three residents will choose the same plumbe

Step-by-step explanation:

For each resident, there are only two possible outcomes. Either they choose the first plumbe, or they choose the second. The plumbers are chosen independent of each other. So we use the binomial probability distribution to solve this question.

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 combinations 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.

Each resident randomly chooses one of the two plumbers.

This means that $p = \frac{1}{2} = 0.5$

Three residents:

This means that $n = 3$

What is the probability that all three residents will choose the same plumb

This is P(X = 0)(all choose the second pumble) or P(X = 3)(all choose the first pumble). So

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

$P(X = 0) = C_{3,0}.(0.5)^{0}.(0.5)^{3} = 0.125$

$P(X = 3) = C_{3,3}.(0.5)^{3}.(0.5)^{0} = 0.125$

$p = P(X = 0) + P(X = 3) = 2*0.125 = 0.25$

25% probability that all three residents will choose the same plumbe

4 0

3 years ago

I need help trying to find the trig function for this problem

Anon25 [30]

9514 1404 393

Answer:

x ≈ 136.7 ft

Step-by-step explanation:

As you have marked, the relevant sides are the adjacent side and the hypotenuse. The mnemonic SOH CAH TOA reminds you ...

Cos = Adjacent/Hypotenuse

For this triangle, that means ...

cos(43°) = (100 ft)/x

x = (100 ft)/cos(43°) . . . . . . . . . . multiply both sides by x/cos(43°)

x ≈ 136.73 ft

The length x is about 136.7 feet.

5 0

3 years ago