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2 years ago

The square of the sum of a number and 3 is 16. Find the number.(There are two solutions.)

Mathematics

2 answers:

iren2701 [21]2 years ago

5 0

1,-7 hope this helps

mote1985 [20]2 years ago

3 0

Answer:

1 , -7

Step-by-step explanation:

(x+3)² = 16

then

(x+3)² = 4²

then

|x+3| = 4

then

x+3=4 or x+3= -4

then

x=4-3=1 or x= -4-3= -7

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Select the choice which shows all of the diagonals in this polygon and tells how many there are.

Leona [35]

Answer:

Answer C

Step-by-step explanation:

If the polygon has n sides, then the number of diagonals the polygon has is

(n - 3)*n/2

So for a seven sided figure the number of diagonals would be

(7 - 3)(7)/2 = 4*7/2 = 28/2 = 14

6 0

2 years ago

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A plane is flying within sight of the Gateway Arch in St. Louis, Missouri, at an elevation of 30,000 ft. The pilot would like to

Maurinko [17]

Answer:

X = 33,669.78 ft

Y = 15285.76 ft

Step-by-step explanation:

Given data:

let x be the distance btwn arch and plane

and y be the distance btwn ground point and arch y

we know that

$cos\theta = \frac{adjacent}{hypotaneous}$

$cos(27) = \frac{30,000}{x}$

xcos27 = 30000

$x = \frac{30000}{cos 27}$

x = 33,669.78 ft

b) we knwo that

$tan \theta = \frac{opposite}{adjacent}$

$tan 27 = \frac{y}{30000}$

y = tan(27) (30000)

y = 15285.76 ft

8 0

2 years ago

Can someone perz help

storchak [24]

A is the correct answer cause you get heads twice as often as tails

7 0

2 years ago

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1.25 × 109 + 3.50 × 109 + 3.25 × 109 =

Nadusha1986 [10]

Answer:

872 is the final answer

Step-by-step explanation:

5 0

2 years ago

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I neeeddddd helpppppppp plllllzzzz

vesna_86 [32]

Step-by-step explanation:

-3x + 7y = 5x + 2y (you subtract the 2y from both sides)

-3× + 5y = 5x (then add 3x to both sides)

5y = 8x (use x = - 5)

5y = 8x - 5 = -40 (both sides are divided by 5)

y = -8

answer is (-5, -8)

6 0

2 years ago