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Amiraneli [1.4K]
2 years ago
12

Help please!! 15 points!!

Mathematics
1 answer:
dolphi86 [110]2 years ago
7 0
15 points I got you!!!
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A model airplane is shot up from a platform 1 foot above the ground with an initial upward velocity of 56 feet per second.
solmaris [256]
h=-16t^2+56t+1

The ball will hit the ground when h=0:
-16t^2+56t+1=0
D=b^2-4ac=56^2-4*(-16)*1=3136+64=3200
t=\frac{-b-\sqrt{D}}{2a}=\frac{-56-\sqrt{3200}}{-32}=\frac{-56-56.57}{-32}\approx 3.5
4 0
3 years ago
Which exponential function matches the table?
sveticcg [70]

Answer:

b

Step-by-step explanation:since i helped can i have brainlist please :D

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3 years ago
Roenfeld Corp believes the following probability distribution exists for its stock. What is the coefficient of variation on the
jok3333 [9.3K]

Complete question is attached;

Answer:

Option D: 0.3069

Step-by-step explanation:

Formula for coefficient of variation on the company's stock is;

CV = σ/E(r)

Where σ is the standard deviation and E(r) is expected value of return.

From the attached image, we can find E(r) as;

E(r) = 0.45(25) + 0.5(15) + 0.05(5)

E(r) = 19%

From online calculation, the standard deviation is 5.83%

Thus;

CV = 5.831/19

CV ≈ 0.3069

8 0
3 years ago
When Famke charges her phone, it gains 222 percentage points each minute. When Famke uses her phone, it loses 555 percentage poi
Charra [1.4K]
To answer this you can use a guess and check strategy.

Start with 5 minutes using it (25% lost) and 10 minutes charging (20% gained).

Try 7 minutes using it (35% lost) and 14 minutes charging (28%).

Next, 9 minutes (45%) and 18 minutes(36%).

10 minutes (50%) and 20 minutes (40%). This is the difference.

She used it for 10 minutes and charged it for 20 minutes.
6 0
3 years ago
Read 2 more answers
The sycamore grove contains 30 sycamo
Zinaida [17]

Answer:

40 trees

Step-by-step explanation:

Let the total number of trees be x.

75% of all the sycamore trees in the park are 30 trees.

So,75%of x=30

or,(75/100)*x=30

or,x=(30*100)/75

or,x=40 [ANS]

7 0
3 years ago
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