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expeople1 [14]
3 years ago
14

Please help 5x^2+21x+4

Mathematics
2 answers:
SVEN [57.7K]3 years ago
8 0

Answer:

(5x+1) (x+4)

Step-by-step explanation:

Daniel [21]3 years ago
5 0
I think it’s (x+4)*(5x+1)

Write 21x as a sum ~ 20x + x

5x^2+20x+x+4

Then you factor out the 5x from the expression

5x * (x+4) + x+4

Then you factor out x+4 from the expression

(X+4) * (5x+1)

Then that’s your answer :) have a great day
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At the craft store, Mark bought a bag of blue and brown marbles. The bag contained 20 marbles, and 30% of them were blue. How ma
kykrilka [37]

Answer:

6 blue marbles

Step-by-step explanation:

20 marbles * .30 are blue = blue marbles

20 * .30 = 6 blue marbles

5 0
3 years ago
A rectangular piece of plywood has a diagonal which measures two feet more than the width. The length of the plywood is twice th
icang [17]

Answer:

The length of the plywood's diagonal(to the nearest tenth) is, 3.6 and 1.4

Step-by-step explanation:

let l be the length and w be the width of the rectangle respectively;

Diagonal(D) of a rectangle is given by:

D = \sqrt{l^2+w^2}                              ......[1]

As per the given statement we have;

Diagonal(D) = width + 2

and

l = 2 \times w = 2w

Now, substitute these in  [1] we have;

\sqrt{(2w)^2+w^2} = w+5

Squaring both the sides we get;

4w^2+w^2 = (w+2)^2

5w^2 = w^2 + 4 + 4w

or

5w^2 -w^2 = 4w + 4 or

4w^2= 4w + 4

Simplify:

w^2-w-1 =0                         ......[2]

The quadratic equation is in the form  of ax^2+bx+c = 0

the solution is given by:  x = \frac{-b \pm\sqrt{b^2-4ac}}{2a}

On comparing with [1] we get

a= 1 , b = -1 and c = -1

Then the solution is:

w= \frac{-(-1) \pm\sqrt{(-1)^2-4(1)(-1)}}{2(1)}

w =\frac{1 \pm\sqrt{1+4}}{2} = \frac{1 \pm\sqrt{5}}{2}

Simplify:

w \approx 1.62 and w \approx -0.62

Then, the diagonal D = w+2

For w \approx 1.62

D = 1.62 +2 \approx 3.62

For w \approx -0.62

D =-0.62 +2 \approx 1.38

therefore, the length of the plywood's diagonal(to the nearest tenth) is, 3.6 and 1.4





5 0
3 years ago
Please help asap! brainliest to best answer! how do you do this???? and what are the answers!
Angelina_Jolie [31]

Answer:

8953.5 seconds

Step-by-step explanation:

Since the challenger descends at a rate of 4 feet per second, divide 35,814 by 4 to get the answer

8 0
3 years ago
Read 2 more answers
Adam had some candy to give to his three children. He first took seven pieces for himself and then evenly divided the rest among
blondinia [14]

Answer : The expression will be

( c - 7 ) / 3

Step-by-step explanation:

Let's say Adam has c pieces of candy

He took ten pieces for himself which means we can write this as c-7

He then divided this amount between his 3 children (c-7)/3

4 0
3 years ago
Translate the phrase into an algebraic expression. The product of w and 5
Stolb23 [73]

The algebraic expression for a phrase is: 5w.

Hope this help.

8 0
3 years ago
Read 2 more answers
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