Marsha jogged 7.8 miles. erica jogged 0.5 times as far. how far did erica jog?

1 answer:

6 0

Solve:-

7.8 × 0.5 = How far Erica jogged
7.8 × 0.5 = 3.9
3.9 Miles

So, if Marsha jogged 7.8 miles, and Erica jogged 0.5 times as far, as Marsha, Erica jogged 3.9 Miles.

Hope I helped ya!! xD

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The mass of the particles that a river can transport is proportional to the sixth power of the speed of the river. A certain riv

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The river flows at 2 miles per hour. This is the speed of the current, or the speed at which the water itself is moving.

The mass of the particles moving in river is proportional to the sixth power of 2, or $2^6 = 64$ miles per hour. So, if x is the mass of the particle, then the speed is modeled by an inverse relationship $x * 2^6 = k$ , for some constant k.

For particles that are 15 times the usual mass, the speed of the river itself must increase for the particles to travel at the same speed as before. The mass of the particles is still proportional to the sixth power of the speed of the river, but the speed of the river can no longer be 2 miles per hour. It is some speed y, which we are solving for.

So, the key here is proportional. We can set up two proportions and cross multiply.

$\dfrac{x}{2^6} = \dfrac{15x}{y^6} \\ (x)(y^6)=(2^6)(15x)$

Cancelling our x's (because we don't need to solve for them), we have

$y^6 = 15(2^6) = 15(64)=960$

To solve for y, we must take the sixth root of both sides, or raise both sides to the one-sixth power.

$\sqrt[6]{y^6} = \sqrt[6]{960}$

Using a calculator, we see that $\sqrt[6]{960} = 3.14 \ miles \ per \ hour$ .