Three slices of bread are to be toasted under a grill. the grill can hold two slices at once but only one side is toasted at a time. it takes 30 seconds to toast one side of a piece of bread, 5 seconds to put a piece in or take a piece out and 3 seconds to turn a piece over. what is the shortest time in which the three slices can be toasted?

159 seconds. The 1st two slices of bread will take 60 seconds to toast. 20 second to put in and out. And 6 seconds to turn them over. The 3rd piece will take 60 seconds to toast, 10 seconds to put in and out, and 3 seconds to turn over. 86 seconds + 73 seconds= 159

175 seconds,  

32 slices of toast

Step-by-step explanation:

20/5  = 5 times

5 (35) = 175 Seconds to make 20 slices of toast

2> 35 seconds to make 4 pieces of toast

60 (4)  =  240

240  + 40 = 280

35/280  = 8

8 (4) = 32 slices of toast

So, Anwers are:

1>    175 seconds to make 20 slices of toast.

2>   32  slices of toast they can make as many times as possible in

4 minutes and 40 seconds.

Hope that helps :)

02/16/2021

The decay function is  

The graph is attached down

The domain is {t: t ≥ 0}

The range is {y: y > 0}

The y-intercept represents the initial value of the couch

The value of the couch in 2014 is $781.25 to the nearest penny

Step-by-step explanation:

The form of the decreasing exponential function is , where

a is the y-intercept ⇒ initial amountr is the rate of in decimaly is the dependent amountx is the independent amount

∵ The value of a couch is decreasing at a rate of 6.3% per year

∴

∴ y represents the amount of money

∴ t represents the number of years

∴ r = 6.3% = 6.3/100 = 0.063

∵ In 2007, the couch was worth  $1,232

∴ The initial value is $1,232

∴ a = 1,232

∵ We need to find the value of the couch in 2014

∴ t = 2014 - 2007 = 7 years

→ Substitute the values of a, r, and t in the function above

∵ The decay function is  

∵

∴

∴ y(7) = 781.2460671

→ Round it to the nearest penny (2 d.p)

∴ y(7) = 781.25

∴ The value of the couch in 2014 is $781.25 to the nearest penny

∵ The y-intercept is the value of y at t = 0

∴ The y-intercept represents the initial value of the couch

→ The graph is attached down

→ The domain is {t: t ≥ 0}

→ The range is {y: y > 0}