Answer:
40
Step-by-step explanation:
5 people in the room have 5*40 = 200 years altogether
a new person is X years old.
Now 6 people have (200 + x) years altogether.
Mean age of 6 people is (200+x)/6. and it is also = 40.
So,
(200+x)/6 = 40
200 + x = 240
x = 40
Jenna is correct and Billy is wrong because the equation was not converted to a quadratic form.
<h3>Form of quadratic equation</h3>
The form of quadratic equations is given as
ax2 + bx + c = 0
So, for the quadratic equation, we have
x² - x = 12
Let's make it into quadratic form
x² - x - 12 = 0
Bill solved it as
x(x - 1) = 12
This is wrong, because quadratic equations must be written in the form before solving for the variables
Jenna solved it as
x 2 - x - 12 = 0
Jenna is correct because she converted the equation to a quadratic form before solving for the variables.
Thus, Jenna is correct and Billy is wrong because the equation was not converted to a quadratic form.
Learn more about quadratic equations here:
brainly.com/question/7784687
#SPJ1
Answer:
-216
I dont know if that's right
A. (x+3)(4x+5)
(multiply x with 4x+5 then multiply 3 with 4x+5)
=4x^2+5x+12x+15
=4x^2+17x+15
b,c, and d are similar
To convert ANY decimal to a percent we have to multiply by 100. Lets do it:-
0.08 × 100 = 8
So, the answer choice that best matches this is, c. 8%.
To convert ANY percent to a decimal we have to divide by 100. Lets do it:-
12.4 ÷ 100 = 0.124
So, the answer to What is 12.4% written as a decimal would be 0.124.
Hope I helped ya!! xd
