X^2 + 3x - 18 = 0
Solve using the quadratic formula

Answers

Answer 1

Answer: $x^2+3x-18=0\n\na=1;\ b=3;\ c=-18\n\n\Delta=b^2-4ac\to\Delta=3^2-4\cdot1\cdot(-18)=9+72=81\n\nx_1=(-b-\sqrt\Delta)/(2a);\ x_2=(-b+\sqrt\Delta)/(2a)\n\n\sqrt\Delta=√(81)=9\n\nx_1=(-3-9)/(2\cdot1)=(-12)/(2)=-6;\ x_2=(-3+9)/(2\cdot1)=(6)/(2)=3$

Answer 2

Answer: x+6 and x-3 in which the absolute value would be if a positive 3 and a negative 6

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Which fraction can be represented with a repeating decimal?3/20
12/5
7/16
4/11

Answers

Answer:

Thanks for asking!

Step-by-step explanation:

The answer would be 4/11. 3/20 in decimal form is 0.15. 12/5 is 2.4. 7/16 is 0.4375. 4/11 is 0.36 repeating.

Answer:

4/11

Step-by-step explanation:

=0.363636....

1000 calls received 15% not answered

Answers

A really easy one, just divide the number of calls, 1000, by 15 to get the number of calls unanswered, which is 150. Also, if 150 is taken from 1000, you get the total answered calls via subtraction, which is 850.

Y − x = -13 -4x + 3y = -51

Answers

y - x = -13
-4x + 3y = -51

Use any of the equation to find the value of x or y. In this case, I'll use the 1st equation to find the value of y.

y - x = -13
y = x - 13

Substitute the value of y in the 2nd equation to find the value of x.

-14x + 3y = -51
-14x + 3(x-13) = -51
-14x + 3x - 39 = -51
-11x = -51 + 39
-11x = -12
x = 12/11 or 1 1/11

Substitute the value of x in any equation to find the value of y.

y = x - 13
y = 12/11 - 13
y = 12/11 - (13*11/11) *to get the common denominator
y = (12 - 143)/11 = -131/11 = 11 10/11

to check: x = 12/11 or 1 1/11 ; y = -131/11 or 11 10/11

y - x = -13
-131/11 - 12/11 = -13
(-131 - 12)/11 = -13
-143/11 = -13
-13 = -13

Melanie has a total of 35 coins, consisting of all nickels and dimes.If she has a total of $3.05, how many of each type of coin does she
have?

Answers

Answer:

Well, she must have 30 dimes and 1 nickel.

Step-by-step explanation:

In which quadrant said is each point located.

Answers

Answer:

Quadrent II

Step-by-step explanation:

It is like a elevator. You have to walk to the elevator to go before you can go up. So you go to the negative area first and then climb up because 8 is positive, and that would land you in Quadrent II

2+7x=4-3x I need help solving