Please help me with these questions
Please help me with these questions - 1

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Answer 1
Answer: Besides posting the answers, I also included the solution to solve similar simplification of algebraic expressions questions. :)

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How many solutions does the equation y=3y+5 have

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it has one solution y =--2.5

If s(x) =2-x^2and t(x) =3x which value is equivalent to (s·t)(-7) ​

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the answer is 24 (x) -78

Answer:

987

Step-by-step explanation:

(s.t)(x) = s(x) × t(x) = 3x(2 - x²) = 6x - 3x³

To evaluate (s.t)(- 7) substitute x = - 7 into the product

(s.t)(- 7) = 6(- 7) - 3(- 7)³ = - 42 + 1029 = 987

Janie cut a round slice of watermelon into 3 equal pieces. What's the angle of each piece?

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This would be 120 degrees each. Anything round is 360 degrees and if you cut that into three (which is dividing) it gives you 120
120 degrees 

you take 360 because that is the degrees all the way around the circle divide by 3 for the of slices which equals 120.


What is 19% of 72? I NEED TO KNOW HOW YOU GOT THE ANSWER TO!!

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First you must multiply the number by the percent. (19*27= 513)
Then you divide the answer by 100, or move decimal two places to the left. (513/100= 5.13)
Then round to the nearest whole number (5.13 is approximately 5)
Therefore 19%of 27 = 5
:)

What is 30% in decimal form

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.30. Just move the decimal to the left two places.
To find 30% in decimal form, you do:
30/100=0.3
30% in decimal form is 0.3

Round 73.45 to the nearest whole number

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The nearest whole number is 3 and that is under 5 so you round down. So than your answer will be 73
The answer is 73. 4 is below 5, so you do not have to add one.