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serious [3.7K]
3 years ago
11

Please help me I don't understand. Can someone go step by step explaining what I need to do

Mathematics
1 answer:
DiKsa [7]3 years ago
8 0
For a you need to do (10 times 13) plus (10 times 7) because there's two boxes one is shaded.

For b you need to do (7.5 times 20) plus (2.5 times 20)
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What are the vertex, focus, and directrix of the parabola with the equation x2+8x+4y+4=0
Novay_Z [31]
<span>x2 +8x +4y +4 = 0
</span>4y=<span> -x2 -8x -4</span>y = -.25*x^2 -2x -1
a = -.25b = -2c = -1
x position of vertex:
h = -b / 2a
h = 2 / 2*-.25h = 2 / -.5h = -4
y position of vertex:
k = ah^2 + bh + ck = -.25*-4^2 + -2*-4 + -1k = -4 +8 -1k = 3
VERTEX = (-4, 3)**************************************************************************
x value of focus =x value of vertex = -4
y value of focus =(1 (-b^2 -4ac)) / 4a

a = -.25 b = -2 c =-1
y value = (1 (-4 -4*-.25*-1)) / 4*-.25
y value = (1 (-4 -4*-.25*-1)) / -1
y value = (1 -4 +1) / -1y value = (-2 / -1)y value = 2
focus value = (-4, 2)
Answer is the last one.

7 0
3 years ago
Which value of n makes this equation true?
jonny [76]

Answer:

the answer is A. -16

Step-by-step explanation:

3(-16)+3= -45

-45/5=

-9

5(-16)-1=-81

-81/9=

-9

-9=-9

4 0
3 years ago
A game at the state fair has a circular target with a radius of 10.7 cm on a square board measuring 30 cm on a side. Players win
Stells [14]

Answer:

The probability of hitting the circular area = P(H) = favorable area/ total area = Area of the circle / Area of the square

Step-by-step explanation:

= π/9

6 0
3 years ago
Find the area 3/4 circle with the radius of 4.<br> THXXXXX
AlexFokin [52]

Step-by-step explanation:

If you were asking what is the 3/4 the area of circle with radius 4 I can answer this.

The area of a circle with radius 4 is π4 ^2=16π

3/4*16π= 12π, thus your answer.

7 0
3 years ago
What is 4/9 equivalent to ?
Marianna [84]
8/18 because just times them by 2 and it will be 8/28.
3 0
3 years ago
Read 2 more answers
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