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2 years ago

13

Someone please help me

1 answer:

padilas [110]2 years ago

7 0

7A. 45+10=55 So 55 is in all of them whole integer and rational numbers 8A. Is no yes yes B.a 9.A > 10.a

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Find the area of the region bounded by the y-axis, x-axis and the line y=-2x+4.

Anna007 [38]

Answer:2

Step-by-step explanation:y = 0 : 0 = -2x + 4 → x = -2 is the x-intercept. Similarly, when the line crosses the y-axis, the x-coordinate at this point will be zero and substituting x = 0 into the equation will give us the y-intercept. x = 0 : y = 0 + 4 → y = 4 is the y-intercept.

3 0

2 years ago

Read 2 more answers

6.1.7 (Video Solution) An article in Human Factors (June 1989) presented data on visual accommodation (a function of eye movemen

horsena [70]

Answer:

- the sample mean is 44

- the sample standard deviation is 12.35

Step-by-step explanation:

given information:

data, $x_{i}$ = 36.45, 67.90, 38.77, 42.18, 26.72, 50.77, 39.0, 50.23

the number of data, n = 8

the sample mean, xbar

xbar = ∑ $x_{i}$ /n

= (36.45+67.90+38.77+42.18+26.72+50.77+39.0+50.23)/8

= 352.08/8

= 44

standard deviation, s

s = $\sqrt{sum(x_{i} - xbar)^{2}/n-1}$

= $\sqrt{(36.45-44)^{2}+(36.45-44)^{2}.........(39.00-44)^{2}+(50.23-44)^{2}/(8-1 )}$

= $\sqrt{\frac{1067.12}{7} }$

= 12.35

7 0

2 years ago

A party store has 54 packs of plates in stock. The packs are either sets of 8 or sets of 12. If the store has 496 total plates i

miss Akunina [59]

Answer:

a 16

Step-by-step explanation:

16 x 12 = 192 plates

496 total plates - 192 = 304

304 packages of 8 plates

304 / 8 = 38 sets of 8 plates

38 + 16 = 54 packs of plates

4 0

3 years ago

Read 2 more answers

Please help quicklyyy!!!

Fiesta28 [93]

Answer:

Its the 3 one

Step-by-step explanation:

7 0

3 years ago

A parabola has a focus of F(8.5,−4) and a directrix of x=9.5.

HACTEHA [7]

Answer:

$-\frac{1}{2}y^2-4y+1=x$

Step-by-step explanation:

A parabola has a focus of F(8.5,−4) and a directrix of x=9.5.

General form of horizontal parabola is

$(y-k)^2=4p(x-h)$

the distance between directrix and focus is the value of p

so p = 8.5 - 9.5 = -0.5

Focus is (h+p , k), given focus is (8.5, -4)

So k = -4 and h+p = 8.5

we know p = -0.5

h +p = 8.5

h - 0.5 = 8.5

so h= 9 and k = -4

vertex is (h,k) that is (9, -4)

Now plug in the value in the general equation

$(y-k)^2=4p(x-h)$ , k= -4, h= 9 , p = -0.5

$(y+4)^2=4(-0.5)(x-9)$

$(y+4)^2=-2(x-9)$

$y^2+8y+16=-2x+18$

subtract 18 on both sides

$y^2+8y-2=-2x$

Divide whole equation by -2

$-\frac{1}{2}y^2-4y+1=x$

4 0

3 years ago