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4 years ago

Help ? What’s the answer ?

Mathematics

1 answer:

ELEN [110]4 years ago

6 0

Answer:

D. - i

Step-by-step explanation:

i = √( - 1)

i³ = √( - 1)*√( - 1)*√( - 1) = √(-1)² *√(-1) = - 1*i = - i

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What is the value of x

masha68 [24]

42...But try to get another answer though because I’m not 100 percent correct

4 0

3 years ago

a science class have five girls and three boys in 7th grade at two girls and two boys in the 8th grade the teacher randomly sele

Elena-2011 [213]

Answer:

Possibility that the students selected are both girls = 31.25%

Step-by-step explanation:

It is given that

A science class have 5 girls and 3 boys in 7th grade

And 2 girls and 2 boys in the 8th grade

In 7th grade total students = 8

In 8th grade total students = 4

Total possibilities = 8 x 4 = 32

The teacher randomly selects a 7th grade and an 8th grade

The number ways a girl selected from 7th grade = 5c1 = 5

The number ways a girl selected from 8th grade = 2c1 = 2

Total possibilities = 5 x 2 = 10

Probability that the students selected are both girls =10 /32 = 31.25%

6 0

4 years ago

What is a correct first step for solving this equation? <br><br> 2x−1(5−3x)=4x+2

MrRa [10]

The first step would be applying the distributive property.

2x - 1(5 - 3x) = 4x + 2

Distributive property.

2x - 5 + 3x = 4x + 2 is what the equation looks like after successfully applying the distributive property.

7 0

3 years ago

Express the ratio as a fraction in simplest form:<br> 18 ounces to 3 cups

IrinaVladis [17]

Answer:

6 : 1

Step-by-step explanation:

divide by 3 on both sides

18 ÷ 3 = 6

3 ÷ 3 = 1

6:1

8 0

3 years ago

Read 2 more answers

efore the overtime rule in a football league was changed, among 400 overtime games, 194 were won by the team that won the coin

jeyben [28]

Answer:

The coin toss does not appear to be fair

Step-by-step explanation:

From the question we are told that

The sample size is $n = 400$

The number of game won by team that won the coin toss at the beginning of overtime $x = 194$

The level of significance is $\alpha = 0.10$

The population proportion is evaluated as

$p = \frac{194}{400}$

$p = 0.485$

Since the population proportion is 0.485 $\approx$ 0.5 which implies that the coin toss is fair then

The Null hypothesis is

$H_o : p = 0.485$

and The Alternative hypothesis is

$H_a : p \ne 0.485$

The test statistics is evaluated as follows

$t = \frac{[x + p] - [\frac{n}{2} ]}{\frac{\sqrt{n} }{2} }$

substituting values

$t = \frac{[194 + 0.485] - [\frac{400}{2} ]}{\frac{\sqrt{400} }{2} }$

$t = -0.5515$

=> $|t| = 0.5515$

now the critical value of $\alpha$ for a two tail test(it is two tailed because we are test whether the critical value is less than or greater than the test statistics ) is

$t_{\alpha } = 1.645$

This is usually found from the critical value table

Now comparing the critical values and the calculated test statistics we see that the critical value is greater than the test statistics hence the Null hypothesis is rejected

This means that the coin toss is not fair

5 0

3 years ago