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3 years ago

12

If square root x = -7, then x= -49 true or false

2 answers:

dimaraw [331]3 years ago

5 0

Answer:True

Step-by-step explanation:

Veronika [31]3 years ago

4 0

Answer:

false

Explanation:

square root of x= -7

the equation would be -7 x -7

-7 x -7= 49 not -49

Answer: false

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2 years ago

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2 years ago

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1 year ago

A detective finds a victim of murder at 9 am. At that time, the temperature of the body is 90.3 degrees F. One hour later, the b

LekaFEV [45]

Answer:

Step-by-step explanation:

Given

at 9 am temperature of the body is $90.3^{\circ}F$

1 hr later temperature $89^{\circ}F$

Temperature of room $T=68^{\circ}F$

According to newtons law

$\frac{\mathrm{d} T}{\mathrm{d} t}=-k\left ( T-T_{room}\right )$

$\frac{\mathrm{d} T}{\mathrm{d} t}=-k\left ( T-68\right )$

$\frac{dT}{T-68}=-kdt$

Integrating

$=\int \frac{dT}{T-68}=-kdt$

$\ln |T-68|=-kt+c$

$T-68=Ae^{-kt}$

Now at 9 am i.e. t=0,

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$89-68=22.3e^{-k}$

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$98.6-68=e^{-0.06006t}$

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Taking log both sides

$t=-5.27$

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i.e. victim murdered at 3 am and 43.8 min

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2 years ago