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Brut [27]
1 year ago
8

Evaluate the expression 2x^3 - 14 when x=2

Mathematics
1 answer:
alexgriva [62]1 year ago
4 0

Answer:

-2

Step-by-step explanation:

2(2)*3-14

4*3-14

12-14

-2

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The length of a rectangle is 2 more than twice the width. The area of the
vlada-n [284]

Answer: w=5 , L= 2+2(5)=12

Step-by-step explanation:

L=2+2W

A= 60

LxW=60, now we will replace the L

(2+2W)(W)=60   we multiply

2w^2+2w=60

2w^2+2w-60=0  we divide by 2 the equation so we can work easier

w^2+w-30=0

find out w using the quadratic equation

we will get 2 solution,

w=5 and another solution is -6, which is not valid, as the side can not be negative

8 0
3 years ago
Rectangle ABCD and right triangle DCE have the same area. They are joined to form a trapezoid, as shown. What is DE?
vfiekz [6]
Since the areas are the same  (5 x 6 = 30 units), and the height of the triangle (DC) is 5 so the length of the triangle must be 12.  (1/2 of  5 x 12 is also 30)

So now we use the Pythagorean theorem

a² + b² = c²   we have 5² + 12² = c²  or 25 + 144 = c²  or 169 = c²

The square root of 169 is 13 so side DE is 13 units.
6 0
4 years ago
SOMEONE HELP PLEASE! I don’t know how to solve this problem nor where to start? Can some please help me out and explain how you
lara31 [8.8K]
That is the answer to your question

4 0
3 years ago
689543 times 438 HELP!
Alborosie
302,019,834 is the answer to your question
8 0
4 years ago
Read 2 more answers
The lengrh of a rectangle is represented by the function L(x) = 5x. The width of that same rectangle is represented by the funct
MrRissso [65]

Step-by-step explanation:

just multiply the 2 together to get the area

it would just be

(5x) \times (2{x}^{2} - 4x + 13)

use the distributive property

10 {x}^{3}  - 20 {x}^{2}  + 65

unless you want to simplify the answer, this would be the answer

simplified, it would be

5(2{x}^{3}  - 4 {x}^{2}  + 13)

7 0
2 years ago
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