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3 years ago

Multiply on the number line 4x(-3)

Mathematics

1 answer:

WINSTONCH [101]3 years ago

6 0

Answer:

-12x

Step-by-step explanation:

solution:

4x(-3)

-4x×3

-12x

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B is true because if you calculate them you’ll know why +173 +28

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3 years ago

Solve the equations. Show your work.<br> 1. a? – 49 = 0

Mademuasel [1]

Answer:

$\boxed{a = 7~~or~~a = -7}$

Step-by-step explanation:

$a^2 - 49 = 0$

$a^2 = 49$

$a = \pm \sqrt{49}$

$a = \pm 7$

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3 years ago

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Answer:

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Step-by-step explanation:

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4 years ago

H= 11 base radius=2 what is the volume of the cone

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4 years ago

A golfer hits a golf ball.

11111nata11111 [884]

Answer:

The golf ball was in the air for 4 seconds.

Step-by-step explanation:

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:

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

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

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

In this question:

We have to find the amount of time it takes for the ball to hit the ground. We have that:

$d(t) = -2t^2 + 7t + 4$

Which is a quadratic equation with $a = -2, b = 7, c = 4$ .

How long is the golf ball in the air?

We have to find t for which $d(t) = 0$

$-2t^2 + 7t + 4 = 0$

$\Delta = b^{2} - 4ac = (7)^2 - 4(-2)(4) = 81$

$t_{1} = \frac{-7 + \sqrt{81}}{2*(-2)} = -0.5$

$t_{2} = \frac{-7 - \sqrt{81}}{2*(-2)} = 4$

Time is a positive measure, so t = 4.

The golf ball was in the air for 4 seconds.

6 0

3 years ago

Multiply on the number line 4x(-3)​

Multiply on the number line 4x(-3)