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aliina [53]
3 years ago
8

Help please, not sure how to do this...​

Mathematics
1 answer:
olga nikolaevna [1]3 years ago
5 0

Answer:

8.38

Step-by-step explanation:

The underlined number is in the hundredths place, so that means that we're going to round there. That means that you look at the number to its right and if it's lower than 5, it stays the same. However, if it's 5 or higher, you round it up. For example, if the number was 8.386, we would round it to 8.39.

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A ball is thrown into the air from a height of 4 feet at time t = 0. The function that models this situation is h(t) = -16t2 + 6
lisov135 [29]

Answer:

  a) 49 ft

  b) 66 ft

  c) 4 seconds

  d) [0, 4] seconds

Step-by-step explanation:

a) Evaluate the function for t=3:

  h(3) = -16·3² +63·3 +4 = (-16·3 +63)·3 +4 = 15·3 +4

  h(3) = 49

The height of the ball is 49 feet after 3 seconds.

__

b) The maximum height of the ball will be found where t=-b/(2a) = -63/-32 = 1.96875.

  h(1.96875) = (-16·(63/32) +63)·(63/32) +4 = 63²/64 +4 = 66.015625

The maximum height of the ball is approximately 66 feet.

__

c) The ball will hit the ground when its height is zero.

  -16t² +63t +4 = 0

Using the quadratic formula, we find the solution to be ...

   t = (-63 - √(63² -4(-16)(4)))/(2·(-16)) = (-63 -√4225)/-32 = -128/-32 = 4

The ball will hit the ground after 4 seconds.

__

d) The function is only useful for the time period between when the ball is thrown and when it lands, t = 0 to t = 4 seconds.

The domain of t in the interval 0 to 4 seconds makes sense for this function.

6 0
3 years ago
Read 2 more answers
Is 9/15 a rational or irrational number
Nataly_w [17]

Answer:

yes

Step-by-step explanation:

Rational numbers include fractions, decimals, whole numbers, and integers.

4 0
3 years ago
Read 2 more answers
A single , six sided die is rolled . find the probability of rolling an odd number less than 4
Feliz [49]

I don't have a lot of experience with chance, but there are 2 odd numbers before 4, 1 and 3, so it would be 2 out of 6 or 33.3 continuing percent.

6 0
3 years ago
Help please as soon as possible
IRISSAK [1]

Answer:

5/3 divided by 1/3 is 5.

6 0
3 years ago
Read 2 more answers
-3r + 7 - 3r - 12 in simplest form
Akimi4 [234]
Since the co-efficient or "r" is "-3" and "-3", it will simplify to "-6" as -3-3= -6.
then the two constant terms with are "7" and "-12" will simplify to "-5" as 7-12=-5. therefore, the simplest form is -6r -5

hope it helped!
8 0
3 years ago
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