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Svet_ta [14]
3 years ago
9

3) -2x – 3y = -7 -4x + y = 21 A) (-8, 4) C) (2, 4) B) (-4,5) D) No solution

Mathematics
1 answer:
ValentinkaMS [17]3 years ago
7 0

Answer: B) (-4,5)

Step-by-step explanation:

Begin the problem by solving for y with the second equation. Add -4x to both sides of the equation so it reads y=4x+21. Then, substitute y into the first equation and solve. -2x-3(4x+21)=-7 turns into -14x-63=-7, which becomes -14x=56. Divide 56/-14 to get -4 for x. Since only one answer has -4 as an option for x, that's the correct answer.

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A television normally sells for $320 this week it’s on sale for 60% off the normal price what is the price of the sale
stira [4]

Answer:

128 dollars

Step-by-step explanation:

You would multiply 60 (that's the percentage off) by 320 ( the price of the T.V) and then subtract the answer you got from multiplying the two from the original price of the T.v (320)

Hope this helps

6 0
2 years ago
Leyla drops a penny from a height of 150m.
dusya [7]
Asked and answered elsewhere.
brainly.com/question/9071599
5 0
2 years ago
Please answer quickly,thanks you shall be marked a branliest<br>​
Leviafan [203]

Answer:

18.0  cm to 1 decimal point.

Step-by-step explanation:

First  work out the unknown side (s) of the right triangle using the Pythagoras theorem:

s^2  = 13^2 - 5^2

       = 169 - 25 = 144

s = sqrt 144 = 12 cm.

Now consider the other triangle:

s = 12

The missing angle = 180 - 65 - 40 = 75 degrees.

By the Sine Rule:

x / sin 75 = 12 / sin40

x = 12 sin 75 / sin 40

  = 18.03

    -

3 0
1 year ago
Can you help me please
Nuetrik [128]
45/45/90 triangles have side lengths leg/leg/leg root2
Here the leg is root 7 and the x is in the hypotenuse so x is root 7 * root 2
Simplifies to root 7*2 = root 14
5 0
2 years ago
paul borrows 1310 at 2% simple intrest per month. when paul pays the loan back 5 years later, what is the total amount that paul
soldier1979 [14.2K]

Answer: The total amount that Paul will end up paying is $1441

Step-by-step explanation:

The formula for determining simple interest is expressed as

I = PRT/100

Where

I represents interest paid on the loan.

P represents the principal or amount taken as loan

R represents interest rate

T represents the duration of the loan in years.

From the information given,

P = 1310

R = 2%

T = 5 years

I = (1310 × 2 × 5)/100 = $131

The total amount that Paul will end up paying is

1310 + 131 = $1441

4 0
3 years ago
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