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Marizza181 [45]
4 years ago
13

PLEASE ANSWER + BRAINLIEST!!!

Mathematics
1 answer:
Arada [10]4 years ago
5 0
Very simple

? – (20 – 4x – 5x2) = 20 – 7x2, so ?  = 20 – 7x2 <span>+ (20 – 4x – 5x2)
</span>?  = 20 – 7x2 <span>+ (20 – 4x – 5x2)=20-7x²+20-4x-5x²=40-12x²-4x
</span>the answer is <span>C. 40-4x-12x^2</span>
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How do I️ graph y+2x=3
algol [13]
Y + 2x = 3....put this in y = mx + b form by subtracting 2x from both sides
y = -2x + 3

so u have a slope of -2 and a y int of 3 or (0,3)

ur x int can be found by subbing in 0 for y and solving for x
y + 2x = 3
0 + 2x = 3
2x = 3
x = 3/2 or 1.5....so ur x int is (1.5,0)

so go ahead and plot ur intercepts (1.5,0) and (0,3).....and since u have a slope of -2, start at (0,3)....come down 2 spaces, then go right 1 space....plot that...then down 2 and to the right 1...plot that...keep doing this and u should cross the x axis at (1.5,0)....then connect ur plotted points and u have ur line.
6 0
4 years ago
The length of a rectangle is 15 more than 3 times the width. The perimeter is 110. What is the area
Arada [10]

Answer:

450 units squared

Step-by-step explanation:

2(length)+2(width)=Perimeter

W=x     Length=15+3w   Perimeter=110

2(15+3w)+2w=110

30+6w+2w=110  

8w=80

w=10

So:  Length is 45 and Width is 10

Area is l*w

Area=45*10

Area is 450 units squared

8 0
3 years ago
Helpppppp me plssssss
MaRussiya [10]

I have solved the answer in the pic below, hope it helpss!!!!

8 0
4 years ago
What is the equation of the quadratic graph with a focus of (3, 1) and a directrix of y = 5?
mamaluj [8]

Answer:

y = -⅛(x - 3)² + 3

Step-by-step explanation:

(x - h)² = 4p(y - k)

h = 3

k + p = 1

k - p = 5

2k = 6

k = 3

p = -2

(x - 3)² = 4(-2)(y - 3)

(x - 3)² = -8(y - 3)

y = -⅛(x - 3)² + 3

3 0
4 years ago
9. Naomi bought fabric on sale for $3.20 per
adell [148]

Answer:

x < 12.5 but see below. This is not a straight forward question.

Step-by-step explanation:

Inequality

3.20x < 40

Solution

Divide by 3.2

40 / 3.2 x < 12.5

Here's the question. What do you do with the 0.5? If you think she can buy 1/2 a yard (I think she might be able to in most places stocking bolts of material), then the 0.5 stays.

If you think she can only buy whole yards, then the answer is 12. Since the question does not make it clear, I would go with 12.5 yards. If it marks you wrong then you go with 12.

The question is an inequality. She has to buy less than 12.5

3 0
3 years ago
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