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viktelen [127]
3 years ago
7

Mike spent half of his allowance going to the movies. He washed the family cat and earned $7. What is his weekly allowance if he

ended with $16?
Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
4 0
16 - 7 is 9
9 x 2 is 18
His weekly allowance is 18
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At noon, ship A is 130 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 20 km/h. How fast is
Hitman42 [59]

Answer:

answer = 12.87 km/h

Step-by-step explanation:

Given

Ship A is sailing east at 25 km/h = \frac{dx}{dt}

ship B is sailing north at 20 km/h =\frac{dy}{dt}

here x and y are the  sailing at t = 4 : 00 pm for ship A and B respectively

so we get x = 4 ×25 =100 km/h

                 y = 4× 20 = 80 km/h

let z is the distance between the ships, we need to find \frac{dz}{dt} at t = 4 hr

At noon, ship A is 130 km west of ship B (12:00 pm)

so equation will be

z^2 = (130-x)^2 + y^2......................(i)\\put x = 100 and y = 80 \\\\we |  | get \\

z^2 = 30^2 + 80^2\\z =\sqrt{7300} km/h

derivative first equation w . r. to t we get

2z\frac{dz}{dt} =-2(130-x)\frac{dx}{dt}+2y\frac{dy}{dt}

\frac{dz}{dt} =\frac{1}{z}[(x -130)\frac{dx}{dt} +y\frac{dy}{dt}]

\frac{dz}{dt} = \frac{( -20\times25 + 80\times20)}{\sqrt{7300} }

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3 years ago
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Step-by-step explanation:

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1.5399= x/6

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You can approximate it to the nearest whole number which will be 9

5 0
3 years ago
What is the answer of question 1
jeyben [28]

Answer: don't know sorry

Step-by-step explanation:

7 0
3 years ago
4 people are going to a dinner party. Each person at
vladimir2022 [97]

Answer:

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Step-by-step explanation:

Here is the complete question ;

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3 years ago
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