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3 years ago

a 2- pound box of spaghetti costs $2.50. Philip says the unit costs is 2 over 2.50 = 0.80. Explain his error

Mathematics

1 answer:

My name is Ann [436]3 years ago

6 0

He accidentally placed the numbers in the wrong order. he needs to do 2.50/2 which =1.25. Hope that helped.

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Assume the probability is 1/2 that a child born at any time is a boy and births are independent. What is the probability of the

melisa1 [442]

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2 years ago

An air traffic controller spots two airplanes at the same altitude converging to a point as they fly at right angles to each oth

kodGreya [7K]

Answer:

(a) ðz/ðt = 1500miles/hr

(b) 10minutes

Step-by-step explanation:

Let x rep plane one

Let y rep plane two

ðx/ðt = 1440miles/hr = speed of plane one

ðy/ðt = 420miles/hr = speed of plane 2

ðz/ðt = ? = rate of change of distance btw two plane moving at right angle to meet at point o...

See attachment

Since x² + y² = z²... equation 1

So therefore (240² + 70²) ^½= z = 250 miles = distance between two planes

Differential rate of equation 1 gives

(2x* ðx/ðt ) + (2y* ðy/ðt) = 2z* ðz/ðt

Substituting to get ðz/ðt

(2*240*1440) + (2*70*420) = 2*250*ðz/ðt

750000 = 500 ðz/ðt

ðz/ðt = 1500miles/hr

Since v = d/t where d = distance = 250miles

t = time = ? = time needed for controller to divert one of e planes , v = 1500miles/hr

t = d/v = 250/1500 = 10minutes

4 0

3 years ago

Read 2 more answers

Dan made $5.38 for a half hour of work. At Dan's current rate of pay, how much would Dan make for 8 hours of work?

lawyer [7]

Answer:

The answer is 86.08, hope this helps.

Step-by-step explanation:

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3 years ago

Read 2 more answers

D=m/v solve for v. Please help kinda urgent

Andrei [34K]

Answer:

v = m/D

Step-by-step explanation:

Step 1: Write equation

D = m/v

Step 2: Multiply both sides by v

Dv = m

Step 3: Divide both sides by D

v = m/D

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3 years ago

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LenKa [72]

Answer:

its 60x4-30 its easier that way

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3 years ago