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3 years ago

9

At the school bookstore, pencils cost $1 29 each, erasers cost $2.55 each, rulers cost 3 52 each and a pack of twelve pens costs

$7.56 Which of these sistements are TRUE See all that apply

1 answer:

bonufazy [111]3 years ago

8 0

Answer:

yes its true

Step-by-step explanation:

hope i help have a fant

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Please help it due ASAP <br> Pls SHOW WORKINGS also.

marusya05 [52]

Answer:

D

Step-by-step explanation:

Angle 5 is equal to angle 8 because the two angles are an alternate interior angle. We already know that angle 7 and 8 are supplementary because it's adjacent to each other on a straight line. So, since angle 5 and 8 is equal to each other, angle 5 is also supplementary to angle 7.

4 0

2 years ago

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timofeeve [1]

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Step-by-step explanation:

3 0

2 years ago

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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

The measure of AngleRST can be represented by the expression (6x + 12)°. Three lines extend from point S. The space between line

DochEvi [55]

Answer:The measure of angle RST is 120\°

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

m<RST=(6x+12)\° -----> equation A

m<RST=78\°+(3x-12)\° -----> equation B

equate equation A and equation B

(6x+12)\°=78\°+(3x-12)\°

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2 years ago

What is the following sum? <br> 3b^2(^3 √54a) + 3(^3 √2ab^6)

Ksenya-84 [330]

Answer

$12b^{2} \sqrt[3]{2a}$

Step-by-step explanation:

6 0

3 years ago

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