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3 years ago

What's an expression that can be used to multiply 6 x 198 mentally

2 answers:

6 0

So first you do 6×2 since 198 is 2 less than 200

And if you do the math, it would be 12

After that, you do 6×200, since if you round off 198, it would be 209

And if you do the math again, it would be 1200

After that if you subtract 12 from 1200, you would get 1188

So the answer is 1188

( Even if you calculate 6×198the way it is, you would get 1188)

Hope this helps:)

disa [49]3 years ago

3 0

Sense it is metal math you do 6 x 200

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Mark dropped an object from a bridge 400 feet above the ground level with an initial velocity of 0. He knows that the gravitatio

lisabon 2012 [21]

Answer:

The first listed equation is the correct equation to solve

The correct answer is: t = 5 seconds

Step-by-step explanation:

Let me mention first that there is an error in the statement that the gravitational pull of the Earth is 16 ft/s^2. It is in fact 32 ft/s^2, and the actual equation uses half of the acceleration multiplied by the square of the variable time, so it gives as final expression :

$y(t)=-16\,t^2+ 0 \,t +400$

and we want to find the value/s for "t" that make this equation equal zero (when it reaches the ground and the object just touches the ground. This makes the equation we want to solve:

$0=-16\,t^2+ 0 \,t +400\\16\,t^2+0\,t -400=0$

which solving for "t" becomes:

$16\,t^2-400 =0\\16\,t^2=400\\t^2=\frac{400}{16} \\t^2=25\\t= +/- 5\,\,sec$

So we adopt the positive answer (positive time) since the negative value has no physical meaning for this problem.

That is: t = 5 seconds

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3 years ago

Find 50% of 108: Find 25% of 108: Find 75% of 108:

laiz [17]

Answer:

50% of 108: 54

25% of 108: 27

75% of 108: 81

Step-by-step explanation:

Hope this helps have a nice day

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Which of the following represents the factored form of f(x) = x3 − 81x?

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