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jekas [21]
2 years ago
13

Evaluate -2x^2-4x+3 when x=-2

Mathematics
1 answer:
Misha Larkins [42]2 years ago
8 0

Answer:

  3

Step-by-step explanation:

A polynomial is sometimes easier to evaluate if it is first written in Horner form:

  -2x^2 -4x +3 = (-2x -4)x +3

For x = -2, this is ...

  (-2(-2) -4)(-2) +3 = 0(-2) +3 = 3

The value is 3 when x = -2.

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What is the unit rate for 180 miles in 3 hours
Ugo [173]

Hello

Answer:

60 miles per hour

I have given a detailed explanation of the logic behind this.

Explanation:

Consider the structure of the wording: "miles per hour"

The word "per" means for each. There is you clue.

Each is, one of and one of is unit measurement

So the controlling element in this question is that you need to convert the 3 hours into 1 hour.

Using ratio properties

180

3

=

x

miles

1

hour

We need to 'force' the left hand side into the same form as the right. That is: we need to convert the denominator into 1 and see what happens to the numerator.

⇒

180

÷

3

3

÷

3

=

x

1

⇒

60

1

=

x

1

So the unit rate of speed is  

60

miles

per

−−−

hour

Hope this helps

Plz mark me as Brainliest

3 0
3 years ago
A sweater that had 40% discount and I saved 20 dollars, what was the price of the sweater
ioda

Answer:

200

Step-by-step explanation:

200-40% = 180

if we were to have 100-40% it would be 60 but since it's 200 it is now less of a % reduced

7 0
3 years ago
Ethan rolls the number cube and then spins the arrow on the
Anika [276]

Answer:

B 1/2

Step-by-step explanation:

This is right

7 0
3 years ago
Read 2 more answers
Need help with question 7 and 8 with awnser please check photo for problems
Tanzania [10]

Answer:

7) 230mm

8) 98m

Step-by-step explanation:

7)

7x+8+6x+6+9x-4 =22x+10

if x is 10 mm, 22(10)+10 =230mm

8) perimeter of rec =2( l + w )

=2 ( 2x-5+2x+6 ) = 8x + 2

if x  is 12 metres, 8(12)+2 =98m

7 0
2 years ago
What is the value of x in the solution
krok68 [10]

Answer:

x =\dfrac 47

Step-by-step explanation:

~~~~~9x-1 = 2x+3\\\\\implies 9x -2x = 3+1\\\\\implies 7x = 4\\\\\implies x =\dfrac 47

6 0
2 years ago
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