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egoroff_w [7]
3 years ago
9

Maddy took a test with 25 questions. She lost 3 points for each of the 3 questions she got wrong, but she got 2 extra credit que

stions correct and earned 4 points for each of them. What is the total number of points she gained or lost overall​
Mathematics
1 answer:
artcher [175]3 years ago
5 0

if Maddy lost 3 points for every problem she got wrong.. she lost 9 points. but she gained 4 extra credit points so she only lost 5 points.

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Can someone help me I don’t know how to do this
babunello [35]

Answer:

4\ frac {1}{9}

Step-by-step explanation:

The recurring part is .111111

Now the number is 4.1111111111111 and let this number be x.

If you get 10x we shall have

10x=41.1111111111..... Equation 1

x=4.11111.... Equation 2

Subtract equation 2 from 1

10x-x=41.11111111-4.11111111=37

9x=37 hence x=37/9

The number will be \frac {37}{9}=4\frac {1}{9}

4 0
3 years ago
8) (10) Solve the equation y''=x^2-y+3y' y(0)=1 and y'(0) =-1
defon

y''-3y'+y=x^2

The corresponding homogeneous equation,

r^2-3r+1=0

has two roots at r=\dfrac{3\pm\sqrt5}2, so that the characteristic solution is

y_c=C_1e^{(3+\sqrt5)/2\,x}+C_2e^{(3-\sqrt5)/2\,x}

For the particular solution, assume one of the form

y_p=ax^2+bx+c

\implies{y_p}'=2ax+b

\implies{y_p}''=2a

Substituting y_p and its derivatives into the non-homogeneous ODE gives

2a-3(2ax+b)+(ax^2+bx+c)=x^2

ax^2+(-6a+b)x+(2a-3b+c)=x^2

\implies\begin{cases}a=1\\-6a+b=0\\2a-3b+c=0\end{cases}\implies a=1,b=6,c=16

Then the general solution to the ODE is

\boxed{y(x)=C_1e^{(3+\sqrt5)/2\,x}+C_2e^{(3-\sqrt5)/2\,x}+x^2+6x+16}

5 0
2 years ago
WHAT IS THE AVERAGE NUMBER OF POINTS THAT CHANGED HANDS
Delvig [45]
Any context that you could provide??
5 0
3 years ago
Read 2 more answers
Given the graph below, answer the following questions
Anton [14]
Y=-2x-6
reflect over the y axis
down one
to the left 4
4 0
2 years ago
Math help pls, will reward lol, thanks
Ahat [919]

Answer:

see explanation

Step-by-step explanation:

Given f(x) then f(x - 2) represents a horizontal translation of f(x) shifted 2 units to the right, thus

The marked points on f(x) → f(x - 2) are

(0, 0 ) → (2, 0 )

(2, 4 ) → (4, 4 )

(3, 9 ) → (5, 9 )

8 0
3 years ago
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