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Akimi4 [234]
2 years ago
14

Select all of the following that are quadratic equations. 7x2 + 14x = 0 x3 - 3x2 + 1 = 0 5x - 7 = 0 x2 + 3x -5 = 0 x - 5 = 9x +

7 x2 - x = 3x + 7
Mathematics
1 answer:
Tpy6a [65]2 years ago
4 0

Answer:

7x2 + 14x = 0

x2 + 3x -5 = 0

x2 - x = 3x + 7  

Step-by-step explanation:

A quadratic equation has the highest power of x to the second power.  It must have x to the second power

7x2 + 14x = 0  quadratic

x3 - 3x2 + 1 = 0   not quadratic  but cubic

5x - 7 = 0  not quadratic  but linear

x2 + 3x -5 = 0   quadratic

x - 5 = 9x + 7  not quadratic but linear

x2 - x = 3x + 7  quadratic

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Evaluate the expression 15x + 4 for x = -1 1/2​
olga_2 [115]

Answer:

18.5

Step-by-step explanation:

First we plug in the number

-1 1/2 is the same as -1.5

Plugging this in we will have:

15(-1.5) + 4 =

-22.5 + 4 =

-18.5

5 0
2 years ago
On a trip, you had to change your money from dollars to British pounds. You got 560560 pounds for 800800 dollars. How many pound
Vlad [161]
First you need to divide 800,800 by 300,300 because you need to know how these two amounts are related, in order to know how the amounts of pounds you are converting are related.
800,800÷300,300= 2.66666.... (recurring)
If $300,300 goes into $800,800 2.66666 times, then the amount of pounds you want to find goes into £560,560 2.66666 times as well. Let's write this as an equation to solve for x (where x is the amount of pounds you will obtain for $560,560):
2.66666x = 560,560
Divide both sides by 2.66666
x = 210,210
Therefore, you will get £210,210 for $300,000
7 0
3 years ago
Can someone pls help and pls dont get it wrong
STatiana [176]

Answer:

D

Step-by-step explanation:

The inverse property states that any number multiplied by its reciprocal equals 1.

7 0
3 years ago
5 - 7k = -4(k + 1) - 3​
mojhsa [17]

Answer:

5 - 7k = -4(k + 1) - 3​

5 - 7k = -4k - 4 - 3​

7k + 4k = - 4 - 3​ -5

11k = -12

k = -12/11

~batmans wife dun dun dun...

7 0
3 years ago
Read 2 more answers
How do you evaluate the expression-4ac for the following conditions:
Aleonysh [2.5K]
A. -4ac
   
    -4(2)(-3)
    multiply
 
    -4(-6)
    multiply, again

    24

b. -4ac

   -4(-4)(-2)
   multiply

   -4(8)
   multiply, again

   -32

c. -4ac

    -4(-1)(5)
    multiply
 
    -4(-5)
    multiply, again

     20
4 0
3 years ago
Read 2 more answers
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