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Ivanshal [37]
3 years ago
8

Which of the following are solutions to the equation below 4x^2+20x+25=49

Mathematics
2 answers:
Elan Coil [88]3 years ago
8 0

Answer:

x= -6 and x= 1

Step-by-step explanation:

KATRIN_1 [288]3 years ago
4 0
( 2x +5)^2 =4

2x+5=2

2x=-3

X=-3/2
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a street light is at the top of a 18 ft tall pole. a woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a s
shutvik [7]

The most appropriate choice for similarity of triangles will be given by -

Speed of tip of the shadow of woman  = 6 ft/s

What are similar triangles?

Two triangles are said to be similar, if the corrosponding angles of the triangles are same and the corrosponding sides of the triangles are in the same ratio.

Here,

The diagram has been attached here

Let the distance of woman from the pole be x ft and the distance of tip of the shadow to the pole be y ft.

Height of street light = 18 ft

Height of woman = 6ft

The two triangles are similar [As height of woman is parallel to the height of pole]

\frac{y - x}{6}=\frac{y}{18}\\18y - 18x = 6y\\18y - 6y = 18x\\12y = 18x\\y = \frac{18}{12}x\\y = \frac{3}{2}x\\

To find the speed, we have to differentiate both sides with respect to time 't'

\frac{dy}{dt} =\frac{3}{2}\frac{dx}{dt}\\\frac{dy}{dt}=\frac{3}{2} \times 4\\\frac{dy}{dt} = 6

Speed of tip of her shadow = 6 ft

To learn more about similarity of triangles, refer to the link-

brainly.com/question/14285697

#SPJ4

6 0
11 months ago
What expression is equivalent to 1/3(4-5x-1)?
Serhud [2]
1/3( 4 - 5x - 1)


= (1/3)(4 +  - 5x +   - 1)

= (1/3)( 4)  + (1/3)(- 5x)  + (1/3)( - 1)

= 4/3 +  - 5x/3 +  - 1/3

=   - 5x/3  + 1  (Decimal:   - 1.666667x + 1)





Hope that helps!!!!
3 0
2 years ago
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Fay has a lemonade stand.
oee [108]

Answer:

£65

Step-by-step explanation:

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Simplify 3x + 2 (9-5) <br><br>please help....
viktelen [127]
3x+8 
i am pretty sure about that
3 0
3 years ago
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-3(-4r - 5)<br> combining like terms
svp [43]

Answer:

r

=

1

Step-by-step explanation:

3 0
3 years ago
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