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3 years ago

Please answer this question only if you know it!! 25 points and brainliest!!

Mathematics

2 answers:

rewona [7]3 years ago

7 0

Answer:

Step-by-step explanation:

Take 1200+1300+850= 3350

Money per week

--------------------------------------

8*10*5= 400 $ per week

3350/400= 8.3

ladessa [460]3 years ago

7 0

Answer: D. 9 weeks

Step-by-step explanation:

Saying he works 8 hours 5 days a week and he earns 10/hour, he earns 80 dollars per day. 80(money per day) x 5(days he works) equals 400.

400 x 6 is 2,400.

400 x 7 is 2,800.

400 x 8 is 3,200.

400 x 9 3,600.

His total expenses on his vehicle is equivalent to 3,350. Option D gives him enough to afford the expenses, therefore the answer is D.

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PLS HELP!! determine which ordered pair is NOT a solution of y=-4x-2.

Alexxandr [17]

Your answer is B (3, -14)
Good Luck with your Test!!

6 0

3 years ago

Exactly how many planes contain points J, K, and N? 0 1 2 3

Archy [21]

Answer:

Step-by-step explanation:

JK and KN is perpendicular.

Thus no planes contained them except 1

Which is a rectangle.

I hope this helps you :)

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3 years ago

Oliver has a box of toy cars, but he is not sure how many he has. If he arranges the cars in groups of four, he has three left o

Zarrin [17]

X/4 = r3 or 3/4
x/3 = r2 or 2/3
x/5 = r3 or 3/5

we know x is not divisible by 4 3 or 5 and is less than 30.

we know the value ends in 3 or 8 from x/5 = r3

we know the value is greater than 3 from r3

so far we got 13 and 23

13 is eliminated from x/4 = r3 because it is r1 not r3

so the answer is 23

7 0

3 years ago

Show that d^2y/dx^2=-2x/y^5, if x^3 + y^3=1

aalyn [17]

Answer:

y³ + x³ = 1

First, differentiate the first time, term by term:

${3y^{2}.\frac{dy}{dx} + 3x^{2}} = 0 \\\\{3y^{2}.\frac{dy}{dx} = -3x^{2}} \\\\\frac{dy}{dx} = \frac{-3x^{2}}{3y^{2}} \\\\\frac{dy}{dx} = \frac{-x^{2}}{y^{2}}$

↑ we'll substitute this later (4th step onwards)

Differentiate the second time:

$3y^{2}.\frac{dy}{dx} + 3x^{2} = 0 \\\\3y^{2}.\frac{d^{2} y}{dx^{2}} + 6y(\frac{dy}{dx})^{2} + 6x = 0 \\\\3y^{2}.\frac{d^{2} y}{dx^{2}} + 6y(\frac{dy}{dx})^{2} = - 6x \\\\3y^{2}.\frac{d^{2} y}{dx^{2}} + 6y(\frac{-x^{2} }{y^{2} })^{2} = - 6x \\\\3y^{2}.\frac{d^{2} y}{dx^{2}} + 6y(\frac{x^{4} }{y^{4} }) = - 6x \\\\3y^{2}.\frac{d^{2} y}{dx^{2}} + \frac{6x^{4} }{y^{3} } = - 6x \\\\3y^{2}.\frac{d^{2} y}{dx^{2}} = - 6x - \frac{6x^{4} }{y^{3} } \\\\$

$3y^{2}.\frac{d^{2} y}{dx^{2}} = - \frac{- 6xy^{3} - 6x^{4} }{y^{3}} \\\\\frac{d^{2} y}{dx^{2}} = - \frac{- 6xy^{3} - 6x^{4} }{3y^{2}. y^{3}} \\\\\frac{d^{2} y}{dx^{2}} = - \frac{- 2xy^{3} - 2x^{4} }{y^{5}} \\\\\frac{d^{2} y}{dx^{2}} = - \frac{-2x (y^{3} + x^{3})}{y^{5}} \\\\\frac{d^{2} y}{dx^{2}} = - \frac{-2x (1)}{y^{5}} \\\\\frac{d^{2} y}{dx^{2}} = - \frac{-2x}{y^{5}}$

3 0

3 years ago

The following are scores for students in Ms. Kennedy's math class.What is the range of the scores?

Eddi Din [679]

Answer:

The answer will be D. 181

Step-by-step explanation:

603 - 422 = 181

Please mark me as the brainliest.

3 0

2 years ago