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2 years ago

What’s (2^2+8)x7 please help

Mathematics

1 answer:

Ivenika [448]2 years ago

3 0

Answer:

Step-by-step explanation:

2^2=4

4+8=12

12*7=84

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Write the characteristics of a point in Quadrant IV. a. Both coordinates are positive. b. Both coordinates are negative. c. The

Vlad1618 [11]

Answer:

Step-by-step explanation:

x-coordinate is positive while the y-coordinate is negative

4 0

3 years ago

Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to f

STALIN [3.7K]

Answer: b) 84

Step-by-step explanation:

Let p be the prior estimate of the required proportion.

As per given , we have

p =0.5 (The probability of getting heads on a fair coin is 0.5)

Significance level : $\alpha: 1-0.90=0.10\\$

Critical z-value (using z-value table ) : $z_{\alpha/2}=1.645$

Confidence interval width : w= 0.18

Thus , the margin of error : $E=\dfrac{w}{2}=0.09$

Formula to find the sample size ( if prior estimate of proportion is known.):-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

Substitute the values , we get

$n=0.5(1-0.5)(\dfrac{1.645}{0.09})^2$

Simplify ,

$n=83.5192901235\approx84$ [Round of to the next whole number.]

Hence, the number of times we would have to flip the coin =<u>84</u>

hence, the correct answer is b) 84

8 0

3 years ago

What is 2x84 I don’t know the answer to it

lara [203]

Answer:

168

Step-by-step explanation:

2x80 is 160 plus 2x4 is 8 160+8 is 168

8 0

2 years ago

Read 2 more answers

The sum of two integers is 6 and the difference between the numbers is 40. Find the numbers

nevsk [136]

Set up a system of equations.

X+y=6
Y-x =40

Substitution method.

Y=6-x

(6-x)-x =40
6-2x=40
-2x=34
X= -17

Plug it back into the equation.
-17+y=6
Y=33

(-17,33) is one of the possible answers.

8 0

3 years ago

Read 2 more answers

PLZ ANSWER FAST!!!

Triss [41]

Answer:

First option.

Third option.

Fifth option.

Hope this helps :)

5 0

2 years ago