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SpyIntel [72]
3 years ago
15

Is the product of a positive number and a negative number a positive ​

Mathematics
1 answer:
quester [9]3 years ago
8 0

Answer:

Hey there!

False. The product of a positive number and a negative number is always NEGATIVE.

Let me know if this helps :)

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PLZZ help middle school math you just have to explain how to solve it. please don't put big words so I can understand and my tea
Dafna11 [192]

Answer:

tell her you don't understand it and she'll help you ok good luck

8 0
2 years ago
A ball is thrown up in the air, and it's height (in feet) as a function of time (in seconds) can be written as h(t) = -16t2 + 32
olga2289 [7]

Answer:

1) Using properties of the quadratic equation:

Here the height equation is:

h(t) = -16t^2 + 32t + 6

We can see that the leading coefficient is negative, this means that the arms of the graph will open downwards.

Then, the vertex of the quadratic equation will be the maximum.

Remember that for a general quadratic equation:

a*x^2 + b*x + c = y

the x-value of the vertex is:

x = -b/2a

Then in our case, the vertex is at:

t = -32/(2*-16) = 1

The maximum height will be the height equation evaluated in this time:

h(1) = -16*1^2 + 32*1 + 6 = 22

The maximum height is 22ft

2) Second method, using physics.

We know that an object reaches its maximum height when the velocity is equal to zero (the velocity equal to zero means that, at this point, the object stops going upwards).

If the height equation is:

h(t) = -16*t^2 + 32*t + 6

the velocity equation is the first derivation of h(t)

Remember that for a function f(x) = a*x^n

we have that:

df(x)/dx = n*a*x^(n-1)

Then:

v(t) = dh(t)/dt = 2*(-16)*t + 32 + 0

v(t) = -32*t + 32

Now we need to find the value of t such that the velocity is equal to zero:

v(t) = 0 = -32*t + 32

       32*t = 32

            t = 32/32 = 1

So the maximum height is at t = 1

(same as before)

Now we just need to evaluate the height equation in t = 1:

h(1) = -16*1^2 + 32*1 + 6 = 22

The maximum height is 22ft

4 0
3 years ago
(20 Points) !!!<br><br> 5/8 times 4/5<br> Fastest get Brainliest
OleMash [197]
5/8 * 4/5
5*4     20      1
----- = ----- =  ---
8*5    40       2

5/8 * 4/5 = 1/2 or .5
4 0
3 years ago
Read 2 more answers
Need help asap!!!!<br> Here's a screenshot:
Anna007 [38]

Answer:

C

Step-by-step explanation:

7 0
2 years ago
When the fraction below is written as a repeating decimal, which digits are repeating?
kaheart [24]
A, 63. If you put in into the calculator, you divide 7 by 11 and you get an answer with a repeating decimal of 6 and 3.
8 0
3 years ago
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