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3 years ago

What is..x+8y=-157x+8y=-9

Mathematics

2 answers:

Reil [10]3 years ago

7 0

Y =-15/8 -x
y=-9/8 -7x

Sauron [17]3 years ago

6 0

The correct answer is x=1 and y=-2

to solve for x and y, you can either substitute equations or add or subtract the equation.
for my explanation, I will subtract equations.

to start, you must look at the xs and ys to find similarities. since they both have 8y, we can easily subtract the equations to cancel the y for now and find x
x+8y=-15. x+8y=-15
-(7x+8y=-9. = -7x-8y=9

when you subtract the equations you get
-6x=-6
dividing each side by -6 to get the x by itself will give you
x=1
then, solve for y by substituting the 1 in the x stop of either equation
I will be substituting the x in the first equation
1+8y=-15
8y=-16
y=8
both equations should give you the same answer
to check, substitute the x and y in the other equation
7(1)+8(-2)=-9
7-16=-9
-9=-9
so x=1 and y=-2

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C. 3.50

Step-by-step explanation:

He bought a lunch two times, so $1.75*2 = 3.50.

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3 years ago

A square is shown below. Which expression can be used to find the area, in square units, of the shaded triangle in the square?

ELEN [110]

Answer:

Area = $\frac{1}{2} (6)(6)$

Step-by-step explanation:

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3 years ago

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Use the remainder Theorem to find the remainder for the given division. (16z^4-1)/(z+1)

Mice21 [21]

Remainder Theorem: when a polynomial P(x) is divided by (x - a), the remainder is P(a).

Given expression:

$\frac{16z^{4}-1}{z+1}$

In this case:

$P(z)=16z^4-1$ $z=-1$

To know the reminder, we have to plug in the value of z in the polynomial:

$P(-1)=16(-1)^4-1$

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1 year ago

Really need help..... number 14:)

Soloha48 [4]

Without the actually predicted values in comparison to the real values it is only possible to give a very likely answer based on their scale:
a) is 25 million off, which sounds bad but when compared to a few billion in population it's not even 1%
b)3 billion is more than half the world population as error: very unlikely
c)154 billion, unlikely that a prediction is off by a factor of ~30
d)same as c

so a) is most likely the solution, but in theory the predictions could be arbitrarily bad (things like negative population, or extreme growths)

4 0

3 years ago

Consider a deck with 2626 black and 2626 red cards. You draw one card at a time and you can choose either guess on whether it is

gregori [183]

The maximum earning is v(r,b)

Let v(r,b) be the expected value of the game for the player, assuming optimal play, if the remaining deck has r red cards and b black cards.

Then v(r,b) satisfies the recursion

and

The stopping rule is simple: Stop when v(r,b)=0.

To explain the recursion . . .

If r,b>0, and the player elects to play a card, then:

The revealed card is red with probability $\frac{r}{r+b}$ , and in that case, the player gets a score of +1, and the new value is V(r-1,b)

The revealed card is black with probability $\frac{b}{r+b}$ , and in that case, the player gets a score of −1, and the new value is V(r,b-1)

Thus, if r,b>0, electing to play a card yields the value f(r,b).

But the player always has the option to quit, hence, if r,b>0, we get v(r,b)=max(0,f(r,b)).

Implementing the recursion in Maple, the value of the game is

v(26,26)=41984711742427/15997372030584

v(26,26) ≈2.624475549

and the optimal stopping strategy is as follows . . .

If 24≤b≤26, play while r≥b−5.
If 17≤b≤23, play while r≥b−4.
If 11≤b≤16, play while r≥b−3.
If 6≤b≤10, play while r≥b−2.
If 3≤b≤5, play while r≥b−1.
If 1≤b≤2, play while r≥b.
If b=0, play while r>0.

So, The maximum earning is v(r,b)

Learn more about PROBABILITY here

brainly.com/question/24756209

#SPJ4

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2 years ago