I need help plssssssss

If an object is projected upward from ground level with an initial velocity of 128 ft per sec, then it's height in feet after t

antoniya [11.8K]

Answer: t= 4 seconds

Maximum height = 256 feet

Step-by-step explanation:

The height of the object projected upwards after t seconds is given by

s(t)=-16t^2+128t.

The expression is a quadratic equation. When this equation is plotted on a graph, height against time, it takes the shape of a parabola whose vertex represents the maximum height attained by the object.

To get the value of t at the maximum height,

t = -b/2a

From the equation,

a = -16

b = 128

t = -128/-2×-16

= -128 /- 32= 4

it will take 4 seconds to reach its maximum height

To find maximum height attained, put t= 4 in the equation

s(t)=-16t^2+128t

S = -16× 4^2 + 128×4

S = -256+512

S = 256 feet

3 0

3 years ago

Elliot has a total of 26 books. He has 12 more fiction books than nonfiction books. Let x represent the number of fiction books

inysia [295]

Luckily for us, this problem solved the bulk of its own question!

Now, all we have to do is solve for "x", or the amount of fiction books and plug its value back into the original equation to find the value of "y", or the amount of nonfiction books.

2x = 38

x = 19

There are 19 fiction books.

x + y = 26

19 + y = 26

y = 7

There are 7 nonfiction books.

Hope this helps!

7 0

3 years ago

Read 2 more answers

PLZ HELP FAST!??!!!!

masha68 [24]

Answer:

use math way

Step-by-step explanation:

look up math way

5 0

3 years ago

Eric created a rectangular patio using one foot square paving stones which are sold in batches by the dozen. The patio measures

Alex Ar [27]

To figure out the answer, you must first find the area. To do this, multiply the length times the width. In this case, that is 7 feet times 8 feet. That equals 56 feet squared. Because the square paving stones are 1 foot squared, the answer is 56 paving stones in all.

I hope this helped! If you don't mind, please do mark my answer as the Brainliest, as I am trying to get past the Ambitious rank. :)

8 0

3 years ago

A survey of 279 SPC students was taken at registration. Of those surveyed: 51 students had signed up for a Language Arts course

stepladder [879]

Treating the amounts as Venn sets, we have that 161 students signed up for only Math, considering that 40 did not sign for any.

For this problem, we consider the following sets:

Set A: Students that have signed up for Arts.

Set B: Students that have signed up for Humanities.

Set C: Students that have signed up for Math.

4 students had signed up for all three courses students, hence:

(A ∩ B ∩ C) = 4.

8 students had signed up for both a Math and Humanities, hence:

(B ∩ C) + (A ∩ B ∩ C) = 8

(B ∩ C) = 8.

18 students had signed up for both a Math and Language Arts, hence:

(A ∩ C) + (A ∩ B ∩ C) = 18

(A ∩ C) = 14.

9 students had signed up for both a Language Arts and Humanities, hence:

(A ∩ B) + (A ∩ B ∩ C) = 9

(A ∩ B) = 5.

36 students had signed up for a Humanities course, hence:

B + (A ∩ B) + (B ∩ C) + (A ∩ B ∩ C) = 36

B + 5 + 8 + 4 = 36

B = 19.

51 students had signed up for a Language Arts course, hence:

A + (A ∩ B) + (A ∩ C) + (A ∩ B ∩ C) = 36

A + 5 + 14 + 4 = 51

A = 28.

Considering that there are 279 students, and supposing 40 did not sign for any course, we have that:

A + B + C + (A ∩ B) + (B ∩ C) + (A ∩ C) + (A ∩ B ∩ C) + 40 = 279.

28 + 19 + C + 5 + 8 + 14 + 4 + 40 = 279

118 + C = 279

C = 161

161 students signed up for only Math, considering that 40 did not sign for any.

More can be learned about Venn sets at brainly.com/question/24388608

#SPJ1

3 0

2 years ago