Hello,
y=2xe^x
y'=2(e^x+xe^x)=2(x+1)e^x
y''=2(e^x+(x+1)e^x)=2(x+2)e^x
x |-infinite -2 0 +infinite
e^x | ++++++++++++++++++
x+2 |------------0 +++++++++++
y'' | -----------0 +++++++++++
y''<0 if x<-2
<span>The interval on which the graph is concave down is (-infinite -2[</span>
Answer:
D) 54.9 cm^2
Step-by-step explanation:
I found the area of the circle wwith the formula A= πr^2
A= π•64
then I found the area of the square, 256
then I subtracted the area of the circle from the area of the square and got approx. 54.9
hope this helps <3
Answer:
A straight horizontal line ranging from -3 to 1
Step-by-step explanation:
Draw a cartesian plane. Plot (0,-3) and (1,0)
First plotting: x = 0, y = -3
Second plotting: x = 1, y = 0
The plotting gives a straight horizontal line (drawn from left to right)
okay so go down to -8 and then you would from there go up four and over one.
i hope this helps!
Answer:
80 questions.
Step-by-step explanation:
-Let X be the number of problems solved on day 1.
-Questions solved on day 2 are:
We know that the total number of questions solved is 144:
Hence, the number of questions solved on the first day is 80