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4 years ago

PLEASE HELP ME. I’ve been stuck on this this for 2 weeks

Mathematics

2 answers:

murzikaleks [220]4 years ago

3 0

Answer:

Step-by-step explanation:

Lilit [14]4 years ago

3 0

Answer:

20b^4 + 23b^3 + 21b^2 Answer D

Step-by-step explanation:

4b^2 X 5b^2 = 20b^4

4b^2 X -3b = -12b^3

7b X 5b^2 = 35b^3

7b X -3b = -21b^2

35b^3 + (-12b^3) = 23b^3

20b^4 + 23b^3 -21b^2

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Y=3x + 5 <br> Please help

Evgesh-ka [11]

Answer:

whats x?

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Urgent!

boyakko [2]

Step-by-step explanation:

18.

the last one.

-4.9t² + 24.5t + 117.6 = 0

the ball starts at 117.6 meters height. then, during the first seconds the thrust upwards is adding height, until finally, with more and more seconds passing, gravity will win with a vengeance and pulls the ball down faster and faster than any other force in any other direction.

19.

the general solution for a quadratic equation

y = ax² + bx + c

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case

x = t

a = -4.9

b = 24.5

c = 117.6

t = (-24.5 ± sqrt(600.25 - -4×4.9×117.6))/-9.8 =

= (-24.5 ± sqrt(600.25 + 2304.96))/-9.8 =

= (-24.5 ± sqrt(2905.21))/-9.8 = (-24.5 ± 53.9)/-9.8

t1 = (-24.5 + 53.9)/-9.8 = -3

t2 = (-24.5 - 53.9)/-9.8 = 8

a negative time does not make any sense, so the real solution is : the ball reached the ground after 8 seconds.

20.

now the equation is

-4.9t² + 24.5t + 117.6 = 49

but this is quickly transformed again into a "= 0" equation :

-4.9t² + 24.5t + 68.6 = 0

t = (-24.5 ± sqrt(600.25 - -4×4.9×68.6))/-9.8 =

= (-24.5 ± sqrt(600.25 + 1344.56))/-9.8 =

= (-24.5 ± sqrt(1944.81))/-9.8 = (-24.5 ± 44.1)/-9.8

t1 = (-24.5 + 44.1)/-9.8 = -2

t2 = (-24.5 - 44.1)/-9.8 = 7

again, negative time does not make sense.

the ball will be at 49 m height after 7 seconds.

5 0

3 years ago

Each vertical cross-section of the triangular prism shown below is an isosceles triangle.

Fantom [35]

Answer:

<h3>x = 3 units</h3><h3></h3>

Step-by-step explanation:

use Pythagorean theorem:

a² + b² = c²

where a = h

b = 8/2 = 4

c = 5

<u>plugin values into the formula:</u>

h² + 4² = 5²

h² = 5² - 4²

x = √9

x = 3

7 0

3 years ago

Write an equation of the line that passes through (-4,-1) and is perpendicular to the line y =4/3x+6

uysha [10]

The slope would be the negative reciprocal = -3/4
plug in (-4,-1) for x and y to find b.
y = mx+b
-1 = (-3/4)(-4) + b
-1 = 3 + b
-4 = b

THE ANSWER
y = -3/4x -4

6 0

3 years ago

An isosceles triangle has 2 angles that measure 37 degrees each. Write 2 different equations that could be solved to find the me

LuckyWell [14K]

Answer:

The third angle of isosceles triangle is 106° .

Step-by-step explanation:

Given as :

The measures of equal angles of isosceles triangle = 37°

i.e $\Theta _1$ = $\Theta _2$ = 37°

Let The third angle of isosceles triangle = $\Theta _3$

Now,

An isosceles triangle is that whose opposite sides are equal and two angles are equal

<u>Now, From the property of Triangle</u>

The sum of all three angles of Triangle = 180°

i.e $\Theta _1$ + $\Theta _2$ + $\Theta _3$ = 180°

∵ $\Theta _1$ = $\Theta _2$ = 37° (given)

So, 37° + 37° + $\Theta _3$ = 180°

Or, 74° + $\Theta _3$ = 180°

Or, $\Theta _3$ = 180° - 74°

∴ $\Theta _3$ = 106°

So, The third angle of isosceles triangle = $\Theta _3$ = 106°

Hence,The third angle of isosceles triangle is 106° . Answer

7 0

3 years ago