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3 years ago

Plz help meeeeeeee !!!!!

Mathematics

2 answers:

snow_lady [41]3 years ago

3 0

Answer:

answer is A

Step-by-step explanation:

simplify: -28+2r+3r+5

simplify more: 5r-23

ziro4ka [17]3 years ago

3 0

2(-14+r) - (-3r-5)
-28+2r +3r+5
-23+5r
so, the answer is A

Hope this helps!! :)

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Step-by-step explanation:

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3 years ago

The difference between the squares of two numbers is 20. three times the square of the first number increased by the square of t

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We need a system of equations to solve this. "Difference" is to subtract, and we are taking this difference of the 2 squared unknowns to be 20. That equation is $x^{2} -y^2=20$ . Our "first number is x^2, so 3 times that is 3x^2. "Increased by" is adding to that first number. What we are adding is the second number. The second equation is $3x^2+y^2=124$ . Let's solve the first equation for x^2: $x^2=y^2+20$ and sub that value for x^2 into the second equation. $3(y^2+20)+y^2=124$ and $3y^2+60+y^2=124$ . Subtract 60 from both sides and combine the y^2 terms to get $4y^2=64$ . Divide both sides by 4 to get y^2 = 16 and y = 4. Let's go back now and solve for x. We will use the fact that y^2 = 16 to solve for x^2 and then take the square root of it. $x^2-16=20$ , x^2 = 4, so x = 2. Your solutions are x = 2 and y = 4. There you go!

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3 years ago

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7 0

4 years ago

Read 2 more answers

A number is multiplied by 8, and that product is added to 2. The sum is equal to the product of 2 and 25. Find the number.

LenKa [72]

Answer: the number = 6

Step-by-step explanation:

Let x be the number.

Set equation according to the information given

2 + 8x = 2 × 25

Simplify by multiplication

2 + 8x = 50

Subtract 2 on both sides

2 + 8x - 2 = 50 - 2

8x = 48

Divide 8 on both sides

8x / 8 = 48 / 8

$\boxed {x=6}$

Hope this helps!! :)

Please let me know if you have any questions

6 0

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