4x−3y=8 4x−y=−8 work out x and y

2. Find the compound interest on Rs.25, 000 after 2 years compounded

Allushta [10]

Answer:25,000 in 2 years at annual compound interest, if the rates for the successive years be 4% and 5% per annum respectively is: (1) Rs. 30,000 (2) Rs. 26,800 fa) Rs.

A=P[1+

100

r

]

n

⇒ A=Rs.25,000×(

100

106

)

3

⇒ 25,000×

50

53

×

50

53

×

50

53

⇒ A=Rs.29,775.40

⇒ CI=A−P

⇒ Rs.29,775.40−Rs.25,000

∴ CompoundInterest=Rs.4775.40.

6 0

2 years ago

How do I solve number 15?! Plz help!!!!!

Evgesh-ka [11]

first get all variables on the same side, then use elimination to solve.

x = -3

y = -11

3 0

2 years ago

A construction crew is lengthening a road. The road started with a length of 54 miles, and the crew is adding 3 miles to the roa

patriot [66]

53+3(D) = L

53 + 3(38) =L

53 +114 = L

167=L

6 0

2 years ago

For each pair figures, find the ratio of the area of the first figure to the area of the second. 14mm 7mm

Paraphin [41]

The ratio of the area of the first figure to the area of the second figure is 4:1

<h3>Ratio of the areas of similar figures </h3>

From the question, we are to determine the ratio of the area of the first figure to the area of the second figure

The two figures are similar

From one of the theorems for similar polygons, we have that

If the scale factor of the sides of two similar polygons is m/n then the ratio of the areas is (m/n)²

Let the base length of the first figure be ,m = 14 mm

and the base length of the second figure be, n = 7 mm

∴ The ratio of their areas will be

$(\frac{14 \ mm}{7 \ mm})^{2}$

$= \frac{196 \ mm^{2} }{49\ mm^{2} }$

$=\frac{4}{1}$

= 4:1

Hence, the ratio of the area of the first figure to the area of the second figure is 4:1

Learn more on Ratio of the areas of similar figures here: brainly.com/question/11920446

8 0

1 year ago

Solving systems equations by elimination

pishuonlain [190]

I won't answer them all for you (don't want to cheat - need to learn something).
But for the first one given:

-2x-9y=-25
-4x-9y=-23

you set up either x or y (which ever one you want to eliminate) so that one of them cancels.
So this one is easy - you just have to multiply an entire row by negative (doesn't matter which one) - so that the y's will be + and -

Since they're both 9 and they're subracting NOW - you can eliminate the y value. Now add/subtract the x's. So it'd be -2 or 2 depending on how you eliminated y. Then add the number outside of the = sign. Now just solve for x. After that plug in whatever you got for x into both of the rows. Then find the y value.

Hopefully this wasn't confusing -- reply if it is and I will try to simplify. I can give you contact if you need help with the rest

Good luck!

3 0

2 years ago