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4 years ago

Which of the following expressions represents “thr difference of 8 and n”?

Mathematics

1 answer:

Lubov Fominskaja [6]4 years ago

7 0

The difference between 8 and n looks like,

8 - n

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The length of HK¯¯¯¯¯¯ is 24 inches.

DiKsa [7]

The answer is 12 because hk crosses hl and L is right in the middle of hk which equals 24 and half 24 equals 12
since l is half of hk the answer has to be 12

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4 years ago

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5 (2x + 2) - 22=2 (3x+4)

Natalija [7]

Answer:

x+5

Step-by-step explanation:

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3 years ago

You randomly choose two bills from your wallet. What is the probability that they are both $20 bills. There are two 20's, one 10

Softa [21]

Answer:

2/6 or 33.33%

Explanation:

There are 6 numbers all together and 2 of them are 20$.As a fraction this would look like 2/6. 2/6 is also 33.33% of the wallet and its also the probability of pulling out a $20 bill

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3 years ago

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Solve the exponential equation: 3^2– ^x = 1

Flura [38]

$x = 2$

c.) x=2

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3 years ago

A car is being driven at a rate of 40 ft/sec when the brakes are applied. The car decelerates at a constant rate of 10 ft/sec2.

IRISSAK [1]

Answer:

80 feet

Step-by-step explanation:

Given:

Initial speed of the car ( $v_0$ ) = 40 ft/sec

Deceleration of the car ( $\frac{dv}{dt}$ ) = -10 ft/sec²

Final speed of the car ( $v_x$ ) = 0 ft/sec

Let the distance traveled by the car be 'x' at any time 't'. Let 'v' be the velocity at any time 't'.

Now, deceleration means rate of decrease of velocity.

So, $\frac{dv}{dt}=-10\ ft/sec^2$

Negative sign means the velocity is decreasing with time.

Now, $\frac{dv}{dt}=\frac{dv}{dx}(\frac{dx}{dt})$ using chain rule of differentiation. Therefore,

$\frac{dv}{dx}\cdot\frac{dx}{dt}= -10\\\\But\ \frac{dx}{dt}=v.\ So,\\\\v\frac{dv}{dx}=-10\\\\vdv=-10dx$

Integrating both sides under the limit 40 to 0 for 'v' and 0 to 'x' for 'x'. This gives,

$\int\limits^0_{40} {v} \, dv=\int\limits^x_0 {-10} \, dx\\\\\left [ \frac{v^2}{2} \right ]_{40}^{0}=-10x\\\\-10x=\frac{0}{2}-\frac{1600}{2}\\\\10x=800\\\\x=\frac{800}{10}=80\ ft$

Therefore, the car travels a distance of 80 feet before stopping.

4 0

3 years ago