Question

5) Determine the instantaneous rate of change at x = 4 for the graph of y = 7Cosx
Round all non-terminating decimals in the calculations to seven decimal places. Round the final answer to two decimal places.

Answer 1

@jim_thompson5910

Answer 2

sir, i'm either getting an error or there's something wrong wit my calculations... le me start off plz

Answer 3

Type in `7*cos(3.99)` into a calculator such as this one

http://web2.0calc.com/

make sure to switch over to radian mode (click the `rad` button)

Answer 4

yupp we have a problem now... let's do the question together, shall we?!?!?

Answer 5

then do the same for x = 4.01 and find the slope of the line through those two points

that will give you the approximate instantaneous rate of change

you'll need to have calculus to figure out the exact instantaneous rate of change

Answer 6

OMG NOW IT ALL MAKES SENSE... yeah i had my calculator on degrees.

Answer 7

i'm jus going our my notes but i didn't notice that my calculator had to be on radins... so yeah it all makes sense now!!

Answer 8

throughout much of math, degrees are used for angles since they make more sense in real life. It's easy to picture a 90 degree angle. It's just what is taught first

when you move to calculus, that's when radians will be used. It's because radians make derivatives for trig functions much easier. There are other handy applications as well

Answer 9

omg thank you so much sir, GOD BLESS YOU!!, all your hard work is wel lappreciated!! ^.^

Answer 10

You're welcome