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Scilla [17]
3 years ago
13

I need help with this question ??

Mathematics
2 answers:
aliya0001 [1]3 years ago
5 0

Answer:

D

Step-by-step explanation:

x(-3x+4)=x*(-3)+x*4=-3x^2+4x

Alex787 [66]3 years ago
3 0

Answer:

D) -3x^2 +4x

Step-by-step explanation:

When multiplying two variables you have to add the exponents together. Techincally x has an exponent of 1 so does -3x. 1+1 = 2 so the first term is -3x^2 and the next one is 4x

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A rectangular poster is to contain 882 square inches of print. The margins at the top and bottom of the poster are to be 2 inche
Zinaida [17]

Answer:

L  =  23 in

h  = 46  in

Step-by-step explanation:

Let call  " x "  and  " y "  dimensions of the print area of the poster then:

882 = x*y  and   y = 882/x

We also know that dimensions of the poster is:

L  =  x + 2   in  and     h  =  y + 4 in

Therefore area of the poster is:

A(p)  = ( x + 2 ) * ( y + 4 )  And area as function of x is:

A(x)  =   ( x + 2 ) * ( 882/x + 4 )

A(x)  =  882 + 4*x + 1764 /x  + 8

Taking derivatives on both sides of the equation we have:

A´(x)  =  4  - 1764/x²

A´(x)  = 0      ⇒      4  - 1764/x² = 0      ⇒ 4*x² - 1764  =  0

x²  =  1764 / 4

x²  = 441

x  = 21 in      and    y  =  882/x         y  = 42

The second derivative  A´´(x)  is > 0  ( the second term changes its sign to +) there is a minimum for the function at the point      x = 21

As x   and  y are dimensions of the printing area of the poster, dimensions of the poster  are

L  = x  +  2   =   21  + 2  =  23 in   and

h = y  +  4   =   42  + 4  =  46  in

4 0
3 years ago
In parallelogram abcd, ab=14, bc=20, m(angle)b=54. Find to the nearest tenth the length of diagonal bd, and find measure angle d
muminat
It is is a parallelogram, hence we have to face sides equal in length and the opposite angles are also the same. From the given above we have:
ab=14 and its opposite side cd=14
bc=20 and its opposite side da=20

Solving for the diagonal measurement bd, we have consecutive angles are equal to 180°
∠A+∠B=180°
∠A=180°-54°
∠A=126° , ∠B=54° ,∠C=126° and ∠D=54°
bd²=ab²+da²-2(ab)(da)cos126°
bd²=14²+20²-2*14*20cos126°
bd=30.42 unit

Solving for the angle dbc, we have
cos dbc=bc²+bd²-cd²/a*bc*bd
cos dbc=20²+30.42²-14²/2*20*30.42
dbc=21.76° 
3 0
3 years ago
Find the slope betwwen the pair of the points using the slope formula (1,-1) and (6,-1)
laila [671]
Using the slope formula the answer would be 1-(-1)/(-1)-6. The slope would be 2/-7. It would be a negative slope.
4 0
3 years ago
F Jay makes $15 an hour, how long will it take him to earn $90?
Allushta [10]
OK my friend if you times 15 by each of the amount of hours you will find out which one it is but in this case it will be 15 times 6 hours will equal out to be $90
4 0
3 years ago
Read 2 more answers
Probability On a nearby pond, black and white ducks are swimming in groups of three. Use the table to find the experimental prob
miv72 [106K]

Answer:

There are only two choices, a black or white duck, so a coin is the best choice. To represent a set of possible outcomes, toss the coin three times. Repeat the experiment multiple times. To find the probability, divide the observed desired outcomes by the total number of trial

Step-by-step explanation:


6 0
3 years ago
Read 2 more answers
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