3 years ago

Question 3 of 10

Mathematics

2 answers:

12345 [234]3 years ago

8 0

Answer:

F. and D.

Step-by-step explanation:

square root of 81 is 9 because 9 is a number which produces a specified quantity when multiplied by itself.

andreyandreev [35.5K]3 years ago

6 0

The answer should be 9 if I’m not mistaken

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You're on a train that's moving forward at 50 mph. You throw a ball in the direction that the train is moving. Relative to you a

dsp73

Answer:

$Velocity = 70mph$

Step-by-step explanation:

Given

$Train = 50mph$

$Ball = 20mph$

Required

How fast is the ball seem to be moving?

This question illustrates relative velocity;

Since the ball and the train moves in the same direction, the required velocity relative to the person standing behind is:

$Velocity = Train + Ball$

i.e. we add both velocities

$Velocity = 50mph + 20mph$

$Velocity = 70mph$

8 0

3 years ago

Limit

STatiana [176]

Rationalize the numerator:

$\dfrac{\sqrt{x+4}-2}x\cdot\dfrac{\sqrt{x+4}+2}{\sqrt{x+4}+2}=\dfrac{(\sqrt{x+4})^2-2^2}{x(\sqrt{x+4}+2)}=\dfrac x{x(\sqrt{x+4}+2)}=\dfrac1{\sqrt{x+4}+2}$

This is continuous at $x=0$ , so we can evaluate the limit directly by substitution:

$\displaystyle\lim_{x\to0}\frac{\sqrt{x+4}-2}x=\lim_{x\to0}\frac1{\sqrt{x+4}+2}=\frac1{\sqrt4+2}=\frac14$

5 0

3 years ago

Y varies directly with x and y = 12 when x =5 what is the value of y when x = 8

torisob [31]

Y and x are directly proportional, as stated by hypothesis. Let's use the rule of three to find y when x = 8.

x=5 --> y=12
x=8 --> y=?

? = (8*12)/5 = 96/5 = 19.2

So y directly varies with x, and y=12 when x = 5, then y=19.2 when x=8.

Hope this Helps! :D

3 0

3 years ago

68 m<br> 32 m<br> x<br> solve for x

choli [55]

17/8 mxm=m,2

Answer: 17/8 m,2
not sure

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3 years ago

(4,5,6) is a subset of (4,5,6) True or False

Nimfa-mama [501]

Answer:

true~ bc the amount basically

4 0

3 years ago