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lesantik [10]
3 years ago
14

First person to answer 10 points

Mathematics
1 answer:
Assoli18 [71]3 years ago
8 0
It’s the third one. Hopefully this helped
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Daniel dives into a swimming pool. The height of his head is represented by the function h(t) = -8t2 - 28t + 60, where t is the
8_murik_8 [283]
So, h(t) is how far is Daniel's head from the surface of the water, namely the surface itself is when the height is nill, so his head is at the surface and the height of it is just 0, thus h(t)  = 0.  Namely, what is "t" when h(t) is 0?

\bf h(t)=-8t^2-28t+60\implies \stackrel{h(t)}{0}=-8t^2-28t+60
\\\\\\
0=-2t^2-7t+15\implies 2t^2+7t-15=0\implies (2t+3)(t-5)=0
\\\\\\
\begin{cases}
2t+3=0\implies 2t=-3\implies &t=-\frac{3}{2}\\\\
t-5=0\implies &\boxed{t=5}
\end{cases}

clearly the seconds cannot be a negative unit, so is not -3/2.
6 0
3 years ago
PLEASE HELP WILL GIVE BRAINLIEST NOW
hoa [83]

Answer:

5. (2,4)  6. (-1,6)

Step-by-step explanation:

The solution to multiple graphs is where the two graphs meet.  

(-1,6) is the only point where both of the y values are the same.

7 0
3 years ago
How many nickels in five dollars
soldi70 [24.7K]
There are 20 nickels in 1 dollar so you would do 20 x 5 which is 100

So there are 100 nickels in 5 dollars :)

Brainliest Answer please.
8 0
3 years ago
Read 2 more answers
Help me with these questions
egoroff_w [7]
For number 6 it's 30 x 45
5 0
3 years ago
Claire jogs 6 miles per hour and Megan jogs 5 miles per hour. they start together at their campsite and jog to an outpost 18 mil
horrorfan [7]

Answer:

16.364 miles

Step-by-step explanation:

Speed of Claire = 6 miles per hour

Speed of Megan= 5 miles per hour

Distance from camp site to out post = 18 miles

Time for Claire to travel=18/6= 3 hours

Time for Megan to travel = 18/5 = 3.6 hours

The time they meet will be equal

Claire distance= 18 + x

Megan distance = 18-x

Claire time =( 18+x)/6

Megan Tim =( 18-x)/5

(18+x)/6 =(18-x)/5

5(18+x)= 6(18-x)

90 +5x = 108-6x

11x=18

X=18/11

X=1.636 Miles

So the distance from the Outpost to where they meet = 18-1.636

= 16.364 miles

6 0
3 years ago
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