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2 years ago

Can someone please explain how i do this

Mathematics

2 answers:

lukranit [14]2 years ago

8 0

Answer:

base: 4

exponent: 3

numerator: 1

denominator: 64

Step-by-step explanation:

4^4 * 4^-2: Here you subtract 2 from 4 (just basic rules)

so you get 4^2/4^5

4^2/4^5: you subtract 5 from 2 (also basic rules)

then you would get 4^-3

To put in positive exponents you do 1/4^3

which gets you 1/64

julsineya [31]2 years ago

8 0

Base: 4 exponent: 3 this is all I got

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Help me plss!!!!!!!!!

jonny [76]

Answer:

B. SSS

Step-by-step explanation:

We are given two congruent sides.

The third side AB is common and therefore congruent to itself.

It gives us 3 congruent sides.

This is a side-side-side or SSS postulate.

Correct choice is B

5 0

3 years ago

A.The Murray family has produced 8 children.

Vlad [161]

Answer:

A. 0.2734 = 27.34% probability that there are an equal number of boys and girls

B. 0.2753 = 27.53% probability that she’ll answer exactly 5 questions correctly

Step-by-step explanation:

In each of these questions, the binomial probability distribution is used.

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.

A.The Murray family has produced 8 children.

What is the probability that there are an equal number of boys and girls?

8 children means that $n = 8$

Each children is equally as likely to be a boy or a girl, which means that $p = 0.5$

This probability is P(X = 4). So

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

$P(X = 4) = C_{8,4}.(0.5)^{4}.(0.5)^{4} = 0.2734$

0.2734 = 27.34% probability that there are an equal number of boys and girls

B.Margie has the uncanny ability of being able to guess the correct answer to TRUE/FALSE questions with an 80% accuracy rate. Tomorrow’s test has 7 questions on it and she needs to answer 5 questions correctly in order to make the Honor Roll. If she guesses on every question, what is the probability that she’ll answer exactly 5 questions correctly?

80% accurracy rate means that $p = 0.8$

7 questions means that $n = 7$

The probability is P(X = 5). So

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

$P(X = 5) = C_{7,5}.(0.8)^{5}.(0.2)^{2} = 0.2753$

0.2753 = 27.53% probability that she’ll answer exactly 5 questions correctly

7 0

3 years ago

Get brainly if right!! Plsss help

ololo11 [35]

Step-by-step explanation:

t8 = a1 + (n - 1)*d

t8 = 17

17 = a1 + 7*d

t12 = 25

25 = a1 + 11d

17 = a1 + 7d Subtract

8 = 4d Divide by 4

8/4 = 4d/4

2 = d

17 = a1 + 7d

17 = a1 + 7*2

17 = a1 + 14 Subtract 14

3 = a1

Sum 20 terms

The 20 term = a1 + 19*2

The 20 term = 3 + 38

= 41

Sum = (a1 + a20) * 20 / 2

Sum = (3 + 41)* 20/2

Sum = 44 * 10

Sum = 440

4 0

3 years ago

Y = 4x - 5 and (3,4) (7, 3) A. parallel B. perpendicular D. neither

s344n2d4d5 [400]

Answer:

The lines are perpendicular. Option B.

Explanation:

Equation of the Line

One of the characteristics of the line is its slope. It can be determined in two ways:

* From the equation y=mx+b, the m is the slope. The given equation is y=4x-5. Thus, the slope of this line is m=4.

* Suppose we know the line passes through points A(x1,y1) and B(x2,y2). The slope can be calculated with the equation:

$\displaystyle m=\frac{y_2-y_1}{x_2-x_1}$

The points are (3,4) and (7,3), thus the slope is:

$\displaystyle m=\frac{3-4}{7-3}=-\frac{1}{4}$

A. For two lines to be parallel, their slopes must be equal. Since m1=4 and m2=-1/4, the lines are not parallel. Incorrect

B. For two lines to be perpendicular, their slopes must meet the condition:

$m1*m2=-1$

4*(-1/4)=-1

Both lines are perpendicular. Correct choice

D. Since choice B. is correct, this cannot be true. Incorrect

5 0

3 years ago

An employee is marking up new merchandise by 35%. the price they paid for an item is $120. what price will the employee place on

kolezko [41]

The answer would be D: $162 because $120 x 35% or (0.35) = $42 so $120 + $42 gives you $162

4 0

3 years ago

Read 2 more answers

Can someone please explain how i do this​

Can someone please explain how i do this