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3 years ago

PLEASE HELP! FIRST RATIONAL ANSWER GETS BRAINLIEST! PLEASE EXPLAIN

Mathematics

2 answers:

Soloha48 [4]3 years ago

7 0

Answer:

Step-by-step explanation:

Alex Ar [27]3 years ago

3 0

Answer:

D *Brainliest plz

Step-by-step explanation:

Simplify 8 - 1/3 to 23/3.

-5 / (1/2 x 23/3) + 2

Use this rule a/b x c/d = ac/bd.

-5 / 23/2x3 + 2

Simplify 1 x 23 to 23

-5 / 23/2x3 + 2

Simplify 2x3 to 6

-5 / 23/6 + 2

Use this rule a / b/c = a x c/b.

-5 x 6/23 + 2

Use this rule a x 6/c = ab/c

- 5x6/23 + 2

Simplfy 5x6 to 30

Simplify that

16/23

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3x+15/ 6-x for what value of x is the rational expression below to equal zero

Alex73 [517]

X = -5.

You need the numerator to equal 0 in order for the expression to equal 0. So set the top equal to 0 and solve.

5 0

3 years ago

Read 2 more answers

you sell bracelets for 2$ each and necklaces for 3$ each at a local flea market. you collected 95$, selling a total of 37 jewelr

777dan777 [17]

Use simultaneous equations.
let the number of bracelets be y and necklaces be z.
so
2y + 3z = 95. this is formula 1
y + z = 37. this is formula 2
so from formula 2, we can change that to
y = 37 - z. this is formula 3
sub 3 into 1,
2 (37-z) + 3z = 95
74 - 2z + 3z = 95
z = 21
sub z = 21 into 3,
y = 37 - 21
y = 16
therefore you sold 16 bracelets and 21 necklaces

4 0

4 years ago

Human body has 209 bones, 2.9% are in the inner ear hw many bones are in the ear?

lubasha [3.4K]

First, we should change this question into an expression.
- we convert the percent into decimal
209 × 0.029 = 6.061 (I used a calculator for this)

So there are approximately 6 bones in the inner ears, which is approximately 3 bones in each ear.

hope this helps

3 0

3 years ago

Secant RM intersects secant RN at point R. Find the length of RQ. If necessary, round to the hundredths place.

QveST [7]

Answer:

3 Units

Step-by-step explanation:

Secant RM intersects secant RN at point R.

The secants intersects the circle at points P and Q respectively as seen in the diagram.

To determine the length of RQ, we use the Theorem of Intersecting Secants.

Applying this on the diagram, we have:

RP x RN=RQ X RM

4(4+5)=RQ(RQ+9)

Let the length of RQ=x

$4*9=x^2+9x\\36=x^2+9x\\x^2+9x-36=0\\x^2+12x-3x-36=0\\x(x+12)-3(x+12)=0\\(x+12)(x-3)=0\\x+12=0$ x-3=0\\x=-12 or x=3\\Since x cannot be negative$\\x=|RQ|=3$

Therefore, length of RQ=3 Units

7 0

3 years ago

find the t values that form the boundaries of the critical region for a two-tailed test with a=.05 for n=6 n=12

AlexFokin [52]

Answer:

n=6

"=T.INV(1-0.025,5)", and we got the critical values given by: $t_{critical}=\pm 2.5706$

n=12

"=T.INV(1-0.025,11)", and we got the critical values given by: $t_{critical}=\pm 2.201$

Step-by-step explanation:

Previous concepts

The t distribution (Student’s t-distribution) is a "probability distribution that is used to estimate population parameters when the sample size is small (n<30) or when the population variance is unknown".

The shape of the t distribution is determined by its degrees of freedom and when the degrees of freedom increase the t distirbution becomes a normal distribution approximately.

The degrees of freedom represent "the number of independent observations in a set of data. For example if we estimate a mean score from a single sample, the number of independent observations would be equal to the sample size minus one."

Solution to the problem

For n=6

In order to find the critical value we need to take in count that we are conducting a two tailed test, so we are looking on the t distribution with df=n-1=6-1=5 degrees of freedom, a value that accumulates $0.05/2=0.025$ of the area on each tail. We can use excel or a table to find it, for example the code in Excel is:

"=T.INV(1-0.025,5)", and we got the critical values given by: $t_{critical}=\pm 2.5706$

For n=12

In order to find the critical value we need to take in count that we are conducting a two tailed test, so we are looking on the t distribution with df=n-1=12-1=11 degrees of freedom, a value that accumulates $0.05/2=0.025$ of the area on each tail. We can use excel or a table to find it, for example the code in Excel is:

"=T.INV(1-0.025,11)", and we got the critical values given by: $t_{critical}=\pm 2.201$

3 0

4 years ago