3 years ago

HRLP ME PLEASE BRO PLEASE ALL I NEED IS THE ANSWER

Mathematics

1 answer:

earnstyle [38]3 years ago

6 0

Answer:
It’s the first one

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The equation for a parabola has the form y=ax2+bx+c, where a, b, and c are constants and a≠0. find an equation for the parabola

IRISSAK [1]

The equation of parabola is

$y= ax^2 + bx +c$

For point (-1,-9), equation of parabola is

$-9 = a(-1)^2 +b(-1)+c
\\
-9 = a -b+c$

For point (1,7), equation of parabola is

$7 = a(1)^2 + b(1)+c
\\
7 = a + b +c$

For point (-6,-14), equation of parabola is

$-14 = a(-6)^2 +b(-6)+c
\\
-14 = 36a -6b +c$

So we have three equations , which are

$a - b + c =-9,
\\
a + b + c = 7
\\
36a -6b+c = -14$

Subtracting first two equation will give

$-2b = -16
\\
b=8$

Subtracting second and third equation gives

$a+b+c-36a+6b-c = 7+14
\\
-35a +7b = 21
\\
-5a + b =3$

Substituting 8 for b, we will get

$-5a + 8 =3
\\
-5a = -5
\\
a =1$

back substituting 8 for b and 1 for a, we will get

$1+8+c = 7
\\
c = -2$

So we have

$a=1, b=8 and c=-2$

Therefore required equation is

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

7 0

3 years ago

In a certain chemical, the ratio of zinc to copper is 4 to 9. A jar of the chemical contains 396 grams of copper. How many grams

larisa86 [58]

Answer:

176 grams of zinc.

Step-by-step explanation:

4/9 = x/396 where x = the number of grams of zinc.

Cross multiply:

9x = 4*396

x = 4*396/9

x = 176 grams.

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3 years ago

47 + a = 60 <br><br> What is the missing number?

koban [17]

The missing number is 13 since 60-47=13 so A=13

8 0

4 years ago

Read 2 more answers

ASAP!! Please help me. I will not accept nonsense answers, but will mark as BRAINLIEST if you answer is correctly with solutions

jeyben [28]

Answer:

c.) x-2

Step-by-step explanation:

5 0

4 years ago

Read 2 more answers

Might be a little hard to see but please help

yan [13]

The answer is option C

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3 years ago