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sasho [114]
3 years ago
10

{8x-10y=20 and -7x+10y-20

Mathematics
1 answer:
lidiya [134]3 years ago
8 0

Write the equations:

8x-10y=20

-7x+10y=20

Add them using elimination

x=40

Now solve for y

8(40)-10y=20

10y=300

y=30

So there you have it: x=40, y=30.

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Marie is purchasing a $108,000 home with a 30 year ortgage at 5.25%. What is her monthly principal and interest payment
schepotkina [342]

Answer:

Monthly interest rate is r=0,004375

Monthly principal c=590,625

Step-by-step explanation:

Monthly interest payment rate :

r=\frac{5.25}{12}:100=0,0004375

Now, we need to find monthly principal payment : c=\frac{rP}{1-(1+r)^{-N}}

Use this rule : N=30*12=360

P=108000

r=0,004375

c=\frac{0.004375*108000}{1-(1+0.004375)^{-360}} =\frac{472.5}{0.8}=590,625

5 0
3 years ago
Read 2 more answers
Estimate the square root of 50 to the hundredths place
Anarel [89]
We have the following expression:
 root (50)
 Rewriting we have:
 root (50) = root (2 * 25)
 root (2 * 25) = 5 * root (2)
 5 * root (2) = 7.071067812
 Round to the hundredths place:
 root (50) = 7.07
 Answer:
 
the square root of 50 to the hundredths place is:
 
7.07
5 0
3 years ago
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Write as a product of two polynomials.<br> (x-y)^2-a(y-x)
11Alexandr11 [23.1K]

Answer:

(x-y) (a+x-y)

Step-by-step explanation:

(y-x)=-(x-y)

-a(y-x) = a(x-y)

(x-y)^2 = (x-y)(x-y)

(x-y)(a + x - y)

3 0
4 years ago
Can someone explain 5. please ?
GuDViN [60]

Both denominators are 4, so we can add the numerators to place over the common denominator. The numerators are -3 and -3, which add to -6. One way to think of negative numbers is to think of IOUs, which are a way of expressing debt in money. For instance, if you go into a store and buy a $10 item, but only have $3 in your pocket, then you would have to owe the owner $7. This can be represented with -7. If you repeat the process, then you'd have 7+7 = 14 in IOUs total. This would be represented with -14

In short, adding negative numbers is really the same as adding positives, but the final result is negative

So that's why -3+-3 turns into -6. We add the two threes like normal but then make the final result negative. All throughout this process, the denominator stays at 4.

So we end up with -6 over 4 which reduces to -3 over 2. How is this reduction happening? We are simply dividing each piece by the greatest common factor 2.

-6 divided by 2 = -3

4 divided by 2 = 2

5 0
4 years ago
Kyle has 125 marbles. Fifty of these marbles are red and the rest are other colors. What is the ratio of the number of red marbl
mr_godi [17]
50:75 or 50:125   I think is the answer
7 0
3 years ago
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