1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Mice21 [21]
3 years ago
8

Select the correct product. (j + 7)(k - 5)

Mathematics
2 answers:
steposvetlana [31]3 years ago
8 0
Your answer is jk-5j-7k-35
Pavel [41]3 years ago
7 0

Answer:

jk - 5 j + 7 k - 35

Step-by-step explanation:

this is the answer

You might be interested in
Which expression is equivalent lo the following complex fraction?
aev [14]

Answer:

\frac{ - 1}{2}

<h2>Hope this helps you !! </h2>

8 0
2 years ago
Kesha threw her baton up in the air from the marching band platform during practice. The equation h(t) = −16t² + 54t + 40 gives
lapo4ka [179]

Answer:

a) 40 feet

b) 54 ft/min

c) 4 mins

Step-by-step explanation:

Solution:-

- Kesha models the height ( h ) of the baton from the ground level but thrown from a platform of height hi.

- The function h ( t ) is modeled to follow a quadratic - parabolic path mathematically expressed as:

                           h ( t ) = −16t² + 54t + 40

Which gives the height of the baton from ground at time t mins.

- The initial point is of the height of the platform which is at a height of ( hi ) from the ground level.

- So the initial condition is expressed by time = 0 mins, the height of the baton h ( t ) would be:

                         h ( 0 ) = hi = -16*(0)^2 + 54*0 + 40

                         h ( 0 ) = hi = 0 + 0 + 40 = 40 feet

Answer: The height of the platform hi is 40 feet.

- The speed ( v ) during the parabolic path of the baton also varies with time t.

- The function of speed ( v ) with respect to time ( t ) can be determined by taking the derivative of displacement of baton from ground with respect to time t mins.

                        v ( t ) = dh / dt

                        v ( t )= d ( −16t² + 54t + 40 ) / dt

                        v ( t )= -2*(16)*t + 54

                        v ( t )= -32t + 54

- The velocity with which Kesha threw the baton is represented by tim t = 0 mins.

Hence,

                        v ( 0 ) = vi = -32*( 0 ) + 54

                        v ( 0 ) = vi = 54 ft / min

Answer: Kesha threw te baton with an initial speed of vo = 54 ft/min

- The baton reaches is maximum height h_max and comes down when all the kinetic energy is converted to potential energy. The baton starts to come down and cross the platform height hi = 40 feet and hits the ground.

- The height of the ball at ground is zero. Hence,

                     h ( t ) = 0

                     0 = −16t² + 54t + 40

                     0 = -8t^2 + 27t + 20

- Use the quadratic formula to solve the quadratic equation:

                     

                    t = \frac{27+/-\sqrt{27^2 - 4*8*(-20)} }{2*8}\\\\t = \frac{27+/-\sqrt{1369} }{16}\\\\t = \frac{27+/-37 }{16}\\\\t =  \frac{27 + 37}{16} \\\\t = 4

Answer: The time taken for the baton to hit the ground is t = 4 mins

3 0
3 years ago
Andrew jogs for 3 miles each day on the weekdays and for 6.5 miles each day over the weekend. What is the average distance that
kirill [66]
Set up the data:
3,3,3,3,3,6.5,6.5
15+13=28
28/7=4

He runs an average of 4 miles a day
7 0
3 years ago
Read 2 more answers
Having serious block because of the units The density of mercury is 13.6 g/cm3. What approximate mass of mercury is required to
mart [117]
I would approach the problem like this:

1 oz bottle.............................30cm^3
33 oz bottle.............................xcm^3

in a 33 oz bottle will be x=33*30=990cm^3
density=mm/v
13.6g/cm^3= m/ 990cm^3
m= 13.6 * 990=13464 g
or 13.464 kg in a 33 oz bottle
3 0
2 years ago
I need help here’s a picture can somone explain what I need to do??
BigorU [14]

The total area of the composite figure is 176 ft

<h3>How to find the area of a composite figure?</h3>

The area of a composite figure can be found as follows;

Therefore,

Total area = area of rectangle + area of triangle

area of rectangle = lw

where

  • l = length
  • w = width

Therefore,

area of a rectangle = 16 × 8

area of a rectangle = 128 ft²

area of triangle = 1 / 2 bh

where

  • b = base
  • h = height

Therefore,

area of triangle = 1 / 2 × 12 × 8

area of triangle = 48 ft²

Total area of the composite figure = 48 + 128 = 176 ft

learn more on composite figure here: brainly.com/question/12315384

#SPJ1

3 0
1 year ago
Other questions:
  • Choose the fraction that is equal to 3/4. A.3/8 B.6/12 C.9/16 D.6/8
    6·2 answers
  • So sorry, I just don’t understand this Please I’m almost done.
    15·1 answer
  • How you work out 7 (-5v-8)
    10·2 answers
  • Please please please help answer number 6!!!!!!
    14·1 answer
  • A person with a mass of 92kg is running. They accelerate 1.2 m/s2 as they are getting up to speed. What is their force?
    7·1 answer
  • 4y-9=15 what does y equal
    9·1 answer
  • A roll of gasket material is 16 in wide. What length is needed to obtain 15 sq ft of the​ material? (Careful: The numbers are no
    6·1 answer
  • Joe created a video that was originally 77 minutes long. He ended up cutting is by 15%. How long was his video after he cut it?
    6·2 answers
  • (1 point)
    9·1 answer
  • Given that x=6 and y= -4<br> 3x + x over y - y^2
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!