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2 years ago

9a^4+3a^2+21 please answer

Mathematics

2 answers:

ICE Princess25 [194]2 years ago

8 0

3(a^4+a^2+7) the answer to the question

SSSSS [86.1K]2 years ago

4 0

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The height of a radio tower is 400 feet, and the ground on one side of the tower slopes upward at an angle of 10degrees. (a) H

Anettt [7]

Answer:

(a) 412 ft

(b) 276 ft

Step-by-step explanation:

Consider the attached diagram.

(a) The internal angle of triangle RBT at B is 90° -10° = 80°. Since we know lengths RB and BT, we can find the length RT using the law of cosines:

RT² = RB² +BT² -2·RB·BT·cos(80°) = 190² +400² -2·190·400·cos(80°)

RT² ≈ 169,705.477

RT ≈ √169,705.477 ≈ 411.95

The guy wire to the hillside should be about 412 feet long.

(b) The Pythagorean theorem can be used to find the shorter wire length.

LM² = LB² +MB²

LM = √(190² +200²) = √76,100

LM ≈ 275.86

The guy wire to the flat side should be about 276 feet long.

4 0

3 years ago

#1: Write the equation of the graphed line. NO SPACES, ALL LOWERCASE. <br> Please help

ivanzaharov [21]

Answer:

Equation of graphed line is $\mathbf{y=\frac{2}{3}x-3}$

Step-by-step explanation:

We need to write the equation of the graphed line.

The equation will be in slope intercept form $y=mx+b$ where m is slope and b is y-intercept

We need to find slope and y-intercept.

Finding slope

Slope can be found using formula: $Slope=\frac{y_2-y_1}{x_2-x_1}$

We will use points (0,-3) and (3,2)

Looking at the graph, we get $x_1=0, y_1=-3, x_2=3, y_2=-1$

Putting values in graph and finding slope

$Slope=\frac{y_2-y_1}{x_2-x_1}\\Slope=\frac{-1-(-3)}{3-0} \\Slope=\frac{-1+3}{3} \\Slope=\frac{2}{3}$

So, we get slope $\mathbf{\frac{2}{3} }$

Finding y-intercept

y-intercept can be found when x is zero.

So, looking at graph, when x =0, y=-3

So, y-intercept is -3

Equation of Line

So, equation of line having slope $\mathbf{\frac{2}{3} }$ and y-intercept b = -3

$y=mx+b\\y=\frac{2}{3}x-3$

So, Equation of graphed line is $\mathbf{y=\frac{2}{3}x-3}$

8 0

3 years ago

Mia is three years older than twice her sister Brooke's age. The sum of their ages is

galina1969 [7]

Answer:

Brooke can be no older than 21

Step-by-step explanation:

M=3+2B

M+B is less than or equal to 30

3+2B+B=30

3+3B=30

3B=27

B=9

M=21

6 0

3 years ago

Read 2 more answers

A boy named Tyler is paid $25 a day plus $0.25 cents for every newspaper he delivered. After his first day of work, he was paid

DerKrebs [107]

Step-by-step explanation:

equation:

25 + .25x = 225

solution:

.25x = 200

x = 800 newspapers

8 0

3 years ago

An airliner travels 45 miles in 6 minutes. what is the speed in miles per hour?

Romashka-Z-Leto [24]

6 minutes/60minutes = 0.1 hrs
45miles/0.1hour = 450 miles per hour or mph

7 0

3 years ago

Read 2 more answers