A roast is taken from the refrigerator (where the temperature is 40o F ) and put in a 350o F oven. One hour later, the meat thermometer shows a temperature of 90o F. If the roast is done when its temperature reaches 140o F what is the total time the roast should be in the oven

The total time is 2.2 hours

Step-by-step explanation: Please see the attachments

The roasting will be complete in two hours.

Given information:

Initial temperature of the meat in refrigerator is F.

The temperature of the oven is F.

In one hour, the final temperature of the meat in oven is F.

So, the rise in temperature of the meat in one hour is,

Now, meat has to reach a temperature of 140 F to be roasted.

So, the time required for the same will be,

Therefore, the roasting will be complete in two hours.

For more details about roasting or cooling time, refer to the link;

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

75%

step-by-step explanation: