3x + y 2-3

Mathematics

1 answer:

sveticcg [70]3 years ago

7 0

Answer:

The question is invalid. Please rewrite the question.

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Sis said hey 5 times. Other sis said hello 5 times higher. How many times did other sis say Hello.

77julia77 [94]

Answer:

The sis that said hello 5 times higher said hello 10 times

Step-by-step explanation:

The first sis said hay online 5 times

The second sis said hello 5 times higher

5 times higher meaning she said hello 10 times in total

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3 years ago

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If 3 notebooks cost $3.51, how much would 7 notebooks cost?

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Simplify the expression to a polynomial in standard form:<br> (3x+1)(2x^2-5x+7)

Ilia_Sergeevich [38]

Answer:

6x^3-13x^2+16x+7

Step-by-step explanation:

(3x+1)(2x^2-5x+7)

6x^3-15x^2+21x+2x^2-5x+7

6x^3-15x^2+2x^2+21x-5x+7

6x^3-13x^2+16x+7

5 0

3 years ago

X:y=5:3 and x+y=56<br> what is the value off x-y

Rudiy27

$x:y=5:3\to\dfrac{x}{y}=\dfrac{5}{3}\qquad\text{cross multiply}\\\\3x=5y\qquad\text{divide both sides by 3}\\\\x=\dfrac{5}{3}y\\\\\text{substitute to the equation} \ x+y=56\\\\\dfrac{5}{3}y+y=56\\\\\dfrac{5}{3}y+\dfrac{3}{3}y=56\\\\\dfrac{5+3}{3}y=56\\\\\dfrac{8}{3}y=56\qquad\text{multiply both sides by 3}\\\\8y=3\cdot56\qquad\text{divide both sides by 8}\\\\y=3\cdot7\\\\y=21\\\\\text{substitute the value of y to the equation}\ x=\dfrac{5}{3}y\\\\x=\dfrac{5}{3}\cdot21=5\cdot7=35$