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3 years ago

A father is 60 years old just son is half his age how old was the boy when his father was four times his age

Mathematics

1 answer:

gayaneshka [121]3 years ago

6 0

So, what you would have to do is figure out how old he is not which is 30 yrs old because it is half of 60.

So, after this you would have to find a number that would go into 60 four times which is 15.

So, your answer would be 15.

HOPES THIS HELPS!!!!

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NemiM [27]

Given:

D=165 feet and the frequency of the motion is 1.6 revolutions per minute.

Solution:

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$T=\frac{1}{1.6} \text{ minutes}$

As we know: $\omega=\frac{2\pi}{T}$

Substitute the value of T in the above formula.

$\omega=\frac{2\pi}{\frac{1}{1.6}}\\\omega=3.2\pi$

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This can be written as:

$h(t)=-a\cos(\omega t)\\h(t)=-82.5cos(32.\pi t)$

The actual height of the rider from the ground is:

$h(t)=\text{ Initial height from bottom}+\text{ radius}-82.5\cos(3.2\pi t)\\h(t)=15+82.5-82.5\cos(3.2\pi t)\\h(t)=97.5-82.5\cos(3.2\pi t)$

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3 years ago

Manita carries a box of mass 40 kg. What is the weight of the box?( g=9.8m/s)<br>

Lilit [14]

Explanation:

Mass of boy = 40 kg

Mass of box = 20 kg

Total mass = 60 kg

Initial potential energy = 0 (since height would be 0 initially)

Final potential energy = mgh

Taking g as 10 m/s²,

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So, work done = final potential energy - initial potential energy

= 9,000 J

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3 years ago

The width of a rectangle measures (3v-3w) centimeters, and its length measures (5v-9w) centimeters. Which expression represents

Alex17521 [72]

Answer: The Perimeter of the rectangle, P= 16v −24w

Step-by-step explanation:

Perimeter of a rectangle = 2( L +W) = 2L + 2W

The width of a rectangle is given as (3v-3w) centimeters,

its length is given as (5v-9w) centimetres

The Perimeter,P will now be = 2L + 2W

P=2( 3v-3w) + 2( 5v-9w)

P=6v −6w + 10v - 18 w

adding like terms

P=6v + 10v −6w −18 w

P= 16v −24w

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3 years ago