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2 years ago

HELPSKANDNEKSJJF nakajf

Mathematics

1 answer:

Luba_88 [7]2 years ago

6 0

What the heck does that mean

Ahhhhhhhhhhhhhhhhhhhhhhh

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A simple random sample of 64 8th graders at a large suburban middle school indicated that 88% of them are involved with some typ

ZanzabumX [31]

The margin of error of a 98% confidence interval is given by

$ME=2.33\left(\sqrt{ \frac{p(1-p)}{n} }\right) \\ \\ =2.33\left(\sqrt{\frac{0.88(1-0.88)}{64}}\right) \\ \\ =2.33\left(\frac{0.1056}{64}\right)=2.33(0.0406) \\ \\ =0.0946$

5 0

3 years ago

A piecewise function f(x) is defined as shown. f(x) = StartLayout enlarged left-brace 1st Row 1st column negative five-fourths x

vivado [14]

Answer:

(D)The first column is labeled x with entries 40, 160, 200. The second column is labeled y with entries 60, 15, 0.

Step-by-step explanation:

The piece-wise function, f(x) is defined as follows:

$f(x)=\left\{\begin{array}{ccc}-\frac{5}{4}x+90 &0\leq x$

$f(0)=-\frac{5}{4}*0+90=90\\\\f(16)=-\frac{5}{4}*16+90=70\\\\f(40)=-\frac{3}{8}*40+75=60\\\\f(120)=-\frac{3}{8}*120+75=30\\\\f(160)=-\frac{3}{8}*160+75=15\\\\f(200)=-\frac{3}{8}*200+75=0$

Therefore, the table which could represent the function is that which satisfies the points above.

In option D

$\left|\begin{array}{c|c}x&f(x)\\--&--\\40&60\\160&15\\200&0\end{array}\right|$

<u>The correct option is D</u>

7 0

3 years ago

Can someone please help me with this?!

Alinara [238K]

Answer: $y=\frac{1}{4}x-3$

Step-by-step explanation:

- The equation of the line in the slope intercept form is: $y=mx+b$

Where m is the slope and b is the y-intercept of the line

- Let's choose two points of the line: (8,-1) and (-4,-4).

- You must calculate the slope of the line as following:

$m=\frac{y_2-y_1}{x_2-x_1}=\frac{-4-(-1)}{-4-8}=\frac{1}{4}$

- As you can see in the graph attached, the line intersects the y-axis at -3, then b=-3.

- Substituting values into the equation of the line, you obtain:

$y=\frac{1}{4}x-3$

3 0

2 years ago

A man on a 135-ft vertical cliff looks down at an angle of 16°13' and sees his friend.

iren2701 [21]

A) Use the trigonometric function and ratio cos(x) = A/H. (Adjacent/Hypotenuse)
1. cos(x) = 135/H
2. H*cos(16°) = 135
3. H = 135/cos(16°)
***Make sure calculator is in degree mode***
4. H = 140.44 ft (rounded to two decimal places)
________

b) Use the function and ratio tan(x) = O/A (Opposite/Adjacent)
1. tan(x) = O/A
2. tan(16°) = O/135
3. 135*tan(16°) = O
4. O = 38.71 ft (two decimal places)

Good luck!

6 0

2 years ago

Choose the correct simplification of the expression a2 ⋅ a3.

Andreyy89

Answer:

a^5

Step-by-step explanation:

( thats a to the 5th power. )

6 0

2 years ago