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2 years ago

Please help!!! i need help with this

Mathematics

1 answer:

goblinko [34]2 years ago

5 0

Answer:

Step-by-step explanation:

Combine like terms. Like terms have same variable with same power

a) (2xy + 4x) + (15xy - 5x) = 2xy + 15xy + 4x - 5x

= 17xy - x

b) (6a + 4b² - 3) + (3b² - 5) = 6a + 4b² + 3b² - 3 - 5

= 6a + 7b² - 8

c) (4x³ - 3x² +4x) + (8x² - 5x ) = 4x³ - 3x² + 8x² + 4x - 5x

= 4x³ + 5x² - x

d) (7b - 6a + 9y) - (12b + 5a - 2y) =

In subtraction, add the additive inverse of (12b + 5a - 2y)

additive inverse = - 12b - 5a + 2y

(7b - 6a + 9y) - (12b + 5a - 2y) = 7b - 6a + 9y -12b -5a + 2y

= 7b - 12b -6a - 5a + 9y + 2y

= -5b - 11a + 11y

e) (2x² + 7x - 2 + 9y) - (13x + 4x² + 5 - 6y)

Additive inverse of 13x + 4x² + 5 - 6y = -13x + 4x² - 5 + 6y

(2x² + 7x - 2 + 9y) - (13x + 4x² + 5 - 6y)= 2x² + 7x - 2 + 9y -13x - 4x² -5 +6y

= 2x² - 4x² + 7x -13x -2 - 5 + 9y + 6y

= -2x² - 6x - 7 + 15y

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2 years ago

Liang is ordering new tires for his car. The tires he has have a circumference of 28π inches and a wheel rim with a circumferenc

skelet666 [1.2K]

The radius of tire is larger than radius of wheel by 5 inch

Step-by-step explanation:

We know that circumference of the circle is 2πr where “r” is the radius of the circle

Circumference refers to the dimension of the periphery of the circle. Since tires are put on the periphery of the wheel hence, we considered the circumferential aspect of the wheel.

Given-

Circumference of tires= 28π inches

2πr= 28π cancelling the common term “π” both sides

r (radius of the tires) = 14 inches

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r (radius of the tires) = 9 inches

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