a boy circles 16 km in an hour and a girl runs 4.4 m in a second which is faster using study of rate

Mathematics

2 answers:

bogdanovich [222]3 years ago

6 0

Answer:

boyyyy is always faster

Shtirlitz [24]3 years ago

6 0

Answer:

The boy is faster

Step-by-step explanation

formula from minutes per second to km/h

X x 3600/1000

4.4 x 3600/1000=15.84 km/h is slower than 16 km/h

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HELP PLSS QUICKLY!!!!

tigry1 [53]

3 cans!!!

5x6= 30 (divided by 2= 15)
5x6=30 (divided by 2 = 15)
10x18= 180

180+30= 210

3 cans!!

4 0

3 years ago

E^(8x)+e^(-x) find the interval on which f is increasing

saveliy_v [14]

Assuming ya mean
$f(x)=e^{8x}+e^{-x}$
take derivitive
remember dy/dx e^x=e^x
also the chain rule

so
$f'(x)=8e^{8x}+-1e^{-x}$
find where it equals 0
$0=8e^{8x}+-e^{-x}$
$e^{-x}=8e^{8x}$
multiply both sides by e^x
$1=8e^{9x}$
divide both sides by 8
$\frac{1}{8}=e^{9x}$
take ln of both sides
$ln(\frac{1}{8})=ln(e^{9x})$
$ln(\frac{1}{8})=9x$
divide both sides by 9
$\frac{ln(\frac{1}{8})}{9}=x$

x≈-1/5
f'(-1)<0
f'(0)>0

so it is increasing from x to infinity

the interval it is increasing on is $(\frac{ln(\frac{1}{8})}{9}, \infty)$