La temperatura a una distancia r del centro de una lámina está dada por t=40 (r2? 2r) . la variación instantánea de la temperatura respecto a r está dada por:

For this, the first thing to do is to assume that the function of temperature with respect to r is written in one of the following ways:

Way 1:

Way 2:

To find the instant variation we must find the derivative of the temperature with respect to the distance r.

We have then:

For function 1:

Rewriting

For function 2:

Rewriting

The instantaneous variation of the temperature with respect to r is given by:

Assuming function 1:

Assuming Function 2:

probability for j is 1/4

while

a is 1/6

15% chance.

step-by-step explanation:

3/10 times, the 5 year old will get a tablet. 5/10 times, the 13 yer old will get a tablet. multiply both fractions to get 15/100 times, both would have a tablet.