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3 years ago

What is the value of the variable?

Mathematics

1 answer:

Alex3 years ago

6 0

The value of the variable is 19 degrees

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Find the sum of X -4+ 2X -7

olasank [31]

Answer:

3x-11

Step-by-step explanation:

first of all add the variables=X+2X=3X

THEN ADD CONSTANTS= (-4)+(-7)= -4-7= -11

THEN ADD BOTH CONSTANT AND VARIABLE

3x+(-11)so answer is 3x-11

5 0

4 years ago

PLEASE HELP ASAP!!!!!!!!

steposvetlana [31]

Answer:

4.6.

Step-by-step explanation:

The rocket hits the ground when h(t) = 0. So

$-16t^{2} + 72t + 7 = 0$

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this question:

$-16t^{2} + 72t + 7 = 0$

$a = -16, b = 72, c = 7$

Then

$\bigtriangleup = 72^{2} - 4*(-16)*7 = 5632$

$t_{1} = \frac{-72 + \sqrt{5632}}{2*(-16)} = -0.1$

$t_{2} = \frac{-72 - \sqrt{5632}}{2*(-16)} = 4.6$

Time is a positive measure, so the answer is 4.6.

6 0

3 years ago

What best represents X

tia_tia [17]

Answer:

Step-by-step explanation:

Simple as that.

Can't explain it more. Very sorry.

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KengaRu [80]

Hello! The think the Answer is - 1 1/2

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C added to 45 as a algebraic expression

shepuryov [24]

45 + C
This is simple, don't over think these problems <3

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