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USPshnik [31]
4 years ago
8

Plz help,.................refresh the page before u answer

Mathematics
1 answer:
Inessa [10]4 years ago
3 0
Using the quadratic equation instead of calculus, you can find the x coordinate of the vertex as it will be the midpoint of the two x coordinates of the zeros...

x=(-3±√-27)/2

x=-1.5±√-6.75

That the second term is imaginary does not matter because we will add or subtract this value from -1.5, thus the midpoint of the zeros, the x coordinate of the vertex is -1.5.  And to find the value of y for the vertex we just find the value of y when x=-1.5

y(-1.5)=6.75

Since y>0, the vertex is above the x-axis.


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surface area of prisms. please help with the work shown because i can't figure out how to solve these :(
8090 [49]

here: :)

I did the work, and basically i solved for the area of the faces and then multiplied that by two to get the total surface area of the faces. Then I added in the areas of the sides connecting the two faces:

just as a referral: the formulas to find the faces are as follows:

rectangle: length times width

circle: pi x r^2

trapezoid: h(base1 + base2)

and triangle: (b x h)/2

3 0
3 years ago
Urgent !! please help !! can someone help me with this problem and show work
Lady bird [3.3K]

Answer:

x = 7      x= -2

Step-by-step explanation:

x^2 -5x -14 =0

What 2 numbers multiply to -14 and add to -5

-7*2 = -15

-7 +2 = -5

(x-7) (x+2) =0

Using the zero product property

x-7 =0   x+2 = 0

x = 7      x= -2

5 0
3 years ago
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Derek bought 15 feet of rope for a science project. if he used 10 3/8 feet of the rope, how many feet of rope does he have left
Lubov Fominskaja [6]

Answer:

155.625 or ( 89/160 )

Step-by-step explanation:

7 0
3 years ago
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Help a chick out only if u know what u doing
Monica [59]

Answer:

for 12:00 1 for 1:00 2

Step-by-step explanation:

this is a pattern where each number multiplies itself by 2 making 12:00 and 1:00 pm 1 and 2

edit: is it right? if it is, may I have brainliest?

8 0
3 years ago
Which expression is the product of (x + 4i)(x − 4i)(x + 4)?
Sophie [7]
Answer= x³+4x²+16x+64

Expand the following:(x + 4 i) (x - 4 i) (x + 4)
(x - 4 i) (x + 4) = (x) (x) + (x) (4) + (-4 i) (x) + (-4 i) (4) = x^2 + 4 x - 4 i x - 16 i = -16 i + (4 - 4 i) x + x^2:
-16 i + (-4 i + 4) x + x^2 (4 i + x)
 | | | | x | + | 4 i
 | | x^2 | + | (4 - 4 i) x | - | 16 i
 | | | | (-16 i) x | + | 64
 | | (4 - 4 i) x^2 | + | (16 + 16 i) x | + | 0
x^3 | + | (4 i) x^2 | + | 0 | + | 0
x^3 | + | 4 x^2 | + | 16 x | + | 64:
Answer: x^3 + 4 x^2 + 16 x + 64
7 0
3 years ago
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