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:
10 posters are .12 and 100 are 1.2 inches 1000 posters are 12 inches.
Step-by-step explanation:
.012×10=.12 in
For every 0 in the ten move the decimal back 1.
.012×100=1.2 in
.012×1000=12 in
The probability that the next 4 winners will all be 7th grade students is 3/4
Answer:
20
Step-by-step explanation:
x = price
y = number of keyboard
xy = 540
(x-2)(y+3) = 540
x = 540/y
==> x = 20
==> y = 27
