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3 years ago

ANSWER ALL THE QUESTIONS THEN YOU WILL BE BRAINLIEST!

Mathematics

2 answers:

garik1379 [7]3 years ago

7 0

Answer:

1. 20 - 2n

2. 14

3. 3

Step-by-step explanation:

2. 20 - 2n = 20 - 2(3)

= 20 - 6

= 14

3. If h=27, therefore,

h/9 = 27/9

h = 3

AVprozaik [17]3 years ago

3 0

Answer:

Step-by-step explanation:

1. The difference of means that we are looking at subtraction. Now, we can eliminate the 3rd option because that has addition. Now, let's find the numbers that are being subtracted. Let's call the number n. This means that twice a number is 2n, which eliminates the first option because it has n, not 2n. We know that 20 and 2n are being subtracted, but in which order? Since 20 was stated before 2n, we know that 20 comes first and 2n comes second. The only option that has this is the second one, 20-2n.

2. We use the expression obtained in the last question, 20-2n. Now, we plug in 3 for n, and when we do so, we get 20-2*3 = 20-6 = 14, the third option.

3. We know that h=27 and we want to find the value of h/9. To do this, we simply plug in 27 for h into h divided by 9, and we get 27/9 = 3, the second option. Hope this helps!

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LenKa [72]

Answer:

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Step-by-step explanation:

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Answer:

The values of 'x' are -1.2, 0, 0, $-4i$ or $4i$ .

Step-by-step explanation:

Given:

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3 years ago

Solve the following system of equations:

Vladimir79 [104]

Answer:

(-1,1)

Step-by-step explanation:

We can solve this by either graphing and finding ther point the lines intersect, or mathematically, I'll do both.

Graphing:

Mathematically:

−2x + 4y = 6

y = 2x + 3

See the attached graph. The lines intersect at (-1,1)

--------------------

I'll rearrange the first equation (to make it easier for me):

−2x + 4y = 6

4y = 2x + 6

y = (1/2)x + 1.5

Now lets substitute the second equation into the first so that we can eliminate y:

y = 2x + 3

[(1/2)x + 1.5] = 2x + 3

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If x = -1:

y = 2(-1) + 3

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The solution is x = -1 and y = 1, or (-1,1)

=================

Both approaches give us (-1,1), the solution to the system of equations. It is the only point that satisfies both equations.

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1 year ago

Ron estimates that each crate of apples he buys from his supplier has 120 apples. The actual number is 105 apples. Which value i

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Answer:

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Step-by-step explanation:

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3 years ago

Read 2 more answers

A softball pitcher has a 0.675 probability of throwing a strike for each pitch and a 0.325 probability of throwing a ball. If th

Dafna11 [192]

Answer:

The probability that exactly 19 of them are strikes is 0.1504

Step-by-step explanation:

The binomial probability parameters given are;

The probability that the pitcher throwing a strike, p = 0.675

The probability that the pitcher throwing a ball. q = 0.325

The binomial probability is given as follows;

$p(x) = _{n}C_{x}\cdot p^{x}\cdot q^{1-x}$

Where:

x = Required probability

Therefore, the probability that the pitcher throws 19 strikes out of 29 pitches is found as follows;

The probability that exactly 19 of them are strikes is given as follows;

$\binom{29}{19}(0.675)^{19}0.325^{10} = \frac{29!}{19!\times 10!}\times (0.675)^{19}\times 0.325^{10} = 0.1504$

Hence the probability that exactly 19 of them are strikes = 0.1504

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