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lara [203]
4 years ago
5

Science question down below

Mathematics
2 answers:
gulaghasi [49]4 years ago
7 0
The answer for 15 is low pollution
Vitek1552 [10]4 years ago
4 0
I believe it is the 4th option and low pollution
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Write the equation of the quadratic function with roots -10 and -8 and a vertex at (-9, -3).
frosja888 [35]
Roots at x=-10 and x=-8

if a function has roots at x=r1 and x=r2, then the factored form is
f(x)=a(x-r1)(x-r2) where a is a constant
so

roots -10 and -8
f(x)=a(x-(-10))(x-(-8))
f(x)=a(x+10)(x+8)
now
use (-9,-3)
-3=a(-9+10)(-9+8)
-3=a(1)(-1)
-3=-a
3=a

the equation is
y=3(x+10)(x+8)
or expanded
y=3x²+54x+240
7 0
4 years ago
Muriel says she has written a system of two linear equations that has an infinite number of solutions. One of the equations of t
Vanyuwa [196]
An infinite number of solutions means a coincident line...it is the same line
3y = 2x - 9...divide by 3
y = 2/3x - 3...hmm...same line as answer choice b....they are coincident lines and have infinite solutions
3 0
4 years ago
Read 2 more answers
What is the inverse of the function
cluponka [151]

Answer:

y = (x - 1) / 2            (First answer choice)

Step-by-step explanation:

1) Start with f(x) = 2x + 1

2) Replace f(x) with y:  y = 2x + 1

3) Interchange x and y:  x = 2y + 1

4) Solve this result for y:  2y = x - 1, or y = (x - 1) / 2       (This matches the first                      

                                                                                          answer choice.)

3 0
3 years ago
A item in a shop is increased in price by 20% and then decreased in price by 20% a month later.
oee [108]

Answer:

Decrease of 4% ($4).

Step-by-step explanation:

Suppose the initial price was $100. An increase of 20% will make the price $120.

Now we decrease it 20% which brings it to 120 - 0.20 * 120

= 120 - 24

= $96.

So that's an overall decrease of $4 or 4%.

7 0
4 years ago
Val rented a bicycle while she was on vacation. She paid a flat rental fee of f dollars, plus $8.50 each day. The total cost at
damaskus [11]

The question is incomplete. Here is the complete question:

Val rented a bicycle while she was on vacation. She paid a flat rental fee of f dollars, plus $8.50 each day. The total cost at the end of her vacation was t dollars. Let d represent the number of days Val rented the bicycle. Write an equation representing the total cost at the end of her vacation.

Answer:

t=f+8.5d

Step-by-step explanation:

Given:

Flat rental fee = f

Variable fee per day = $8.50

Total cost at the end vacation = t

Number of days of her vacation = d

Using unitary method, we can find the variable fee for 'd' days.

1 day variable fee = $8.50

Therefore, 'd' days variable fee = 8.50d

Total cost at the end of her vacation can be obtained by adding the fixed rental fee and the variable fee obtained for the given number of days.

Now, total cost is given as:

Total cost = Flat rental fee + Variable fee

Substituting all the variables and framing above in the form of an equation, we get:

t=f+8.5d

Therefore, the equation representing the total cost at the end of her vacation is t=f+8.5d

7 0
3 years ago
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