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svlad2 [7]
3 years ago
7

What is the answer to this?

Mathematics
2 answers:
NNADVOKAT [17]3 years ago
5 0

Answer:

D: 1 hour 48 minutes

Step-by-step explanation:

9 hours as minutes would be 540 minutes. 1-0.25-0.3-0.25=0.2. Nathaniel spent 20% of the 540 minutes reading. 0.2•540=108. 108 minutes is 1 hour and 48 minutes.

Natasha2012 [34]3 years ago
4 0

Answer:

D. 1 hour 48 minutes

Step-by-step explanation:

100-25-25-30=20

20% was spent reading.

20% of 9 is 1.8

1.8 hrs is 1 hrs and 48 mins.

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I don't really know on this one. I'm thinking it's because if T kept going it would go into a 3rd quadrant but I'm not too sure.
enyata [817]
That is correct since the line in T is not straight it would eventually hit the third quadrant
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8 0
3 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
Reflect the point in a the x- axis and b the y-axis (-2,6)
avanturin [10]
If you were to reflect them, the answer would be the same numbers with the opposite sign. Therefore, the answer should be (2,-6) hope that helped!!!!
3 0
3 years ago
What was the mean weight of the blocks? Round Your answer to the nearest whole number?
arsen [322]

Answer:

mean = 11.2 = 11

Step-by-step explanation:

mean = average = (10+11+10+12+10+11+13+13+11+11)/10 = 11.2=11

6 0
3 years ago
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Complete the table for the number of trees planted compared to the number of trees that continue to
Sedaia [141]

Answer:

the answer is gonna be 55 ,34

Step-by-step explanation:

4 0
3 years ago
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