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2 years ago

Please help someone

Mathematics

1 answer:

ioda2 years ago

3 0

Idek no it sorry .......

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One number is nine more than a second number. Four times the first is 6 less than 2 times the second. Find the numbers.

Masteriza [31]

9514 1404 393

Answer:

-12, -21

Step-by-step explanation:

Let x represent the first number. Then the second is x-9. The other relation is ...

4x = 2(x-9) -6

2x = -24 . . . . . subtract 2x, simplify

x = -12

x-9 = -21

The first number is -12; the second number is -21.

6 0

2 years ago

A ski patrol unit has nine members available for duty, and two of them are to be sent to rescue an injured skier. In how many wa

alexgriva [62]

Answer:

Step-by-step explanation:

The number of two of the nine members of ski patrol unit can be chosen is equal to the combinations of 9 taken 2. This can be calculated using the formula:

$\frac{9!}{2!*(9-2)!}$

= $\frac{9!}{2!*7!}$ , where

9! =9×8×7×6×5×4×3×2×1 and

7!=7×6×5×4×3×2×1

2!=2×1 then the equation becomes:

= $\frac{9*8}{2}$ =36

4 0

2 years ago

A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Houston. The stud

iris [78.8K]

Answer:

$-0.048$

Do not reject $H_0:P_1-P_2=0$

Step-by-step explanation:

From the question we are told that

Sample size $n_1=350$

Sample size $n_2=250$

Sample proportion 1 $\hat P= \frac{25}{350} =>0.07$

Sample proportion 2 $\hat P= \frac{19}{250} =>0.076$

95% confidence interval

Generally for 95% confidence level

Level of significance

$\alpha = 1-0.95=>0.05$

$\alpha /2=\frac{0.05}{2} =>0.025$

Therefore

$Z_a_/_2=1.96$

Generally the equation for confidence interval between $P_1 - P_2$ is mathematically given as

$(\hat P_1-\hat P_2)\pm Z_a_/_2\sqrt{\frac{\hat P_1(1-\hat P_1)}{n_1}+\frac{\hat P_2(1-\hat P_2)}{n_2} }$

$(0.07-0.076)\pm 1.96\sqrt{\frac{0.07(1-0.07)}{350}+\frac{0.076(1-0.076)}{250} }$

$(0.07-0.076)\pm 1.96\sqrt{4.66896*10^-^4 }$

$(-0.006)\pm 0.042$

$(-0.006)- 0.042=>-0.048$

$(-0.006)+ 0.042=>0.036$

Therefore

Confidence interval is

$-0.048$

Conclusion

Given the confidence interval has zero

Therefore do not reject $H_0:P_1-P_2=0$

6 0

2 years ago

What is the value of 7 cubed (A) 14 (B) 21 (C) 49 (D) 343

LenaWriter [7]

The answer is d) 343

7 0

2 years ago

Read 2 more answers

How do you simplify 4^-2h^-4j^3

notka56 [123]

j^3
_______
4^2 h^4

when you have negatives, you want them to be positive. To do that you need to convert it into a fraction

7 0

3 years ago