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3 years ago

15

What type of changes indicate a chemical change?

2 answers:

Kipish [7]3 years ago

8 0

Answer:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions

Mkey [24]3 years ago

4 0

Answer:

Change in smell or change, gas bubbles, color change,

Step-by-step explanation:

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Which of the following will have a negative resulte<br>8- (-10)<br>12-14<br>07-(-3)

Cerrena [4.2K]

Answer:

12-14=-2 ***"""""""""""""""

Step-by-step explanation:

<h3>12-14=-2</h3>

6 0

3 years ago

Read 2 more answers

I built a storage shed in the shape of a rectangular box on a square base. The material that I used for the base cost $4 per squ

kumpel [21]

Answer:

side of 6.124 ft and height of 3.674 ft

Step-by-step explanation:

Let's s be the side of the square base and h be the height of the rectangular box.

The base and the roof would have an area of $s^2$ and cost of

$4s^2 + 2s^2 = 6s^2$

The sides would have an area of 4sh and cost of 4sh*2.5 = 10sh

So the total cost for the material is

$6s^2 + 10sh = 450$

$10sh = 450 - 6s^2$

$h = 45/s - 0.6s$

The volume of the shed has the following formula

$V = s^2h = s^2(45/s - 0.6s) = 45s - 0.6s^3$

To find the maximum value for V, we can take its first derivative, and set it to 0

$\frac{dV}{ds} = 45 - 1.2s^2 = 0$

$1.2s^2 = 45$

$s^2 = 45 / 1.2 = 37.5$

$s = \sqrt{37.5} = 6.124 ft$

h = 45/s - 0.6s = 3.674 ft

4 0

3 years ago

1. y = x2 + 2x – 8<br><br> Axis of Symmetry:<br><br> Vertex:<br><br> Domain:<br><br> Range:

valentinak56 [21]

Answer:

Axis of Symmetry: x=-1

Vertex: (-1,-9)

Domain: (- ∞ ,∞ )

Range: (-9,∞ )

Step-by-step explanation:

6 0

3 years ago

3: Find the slope:<br> (2, 18), (4, 28)<br> What’s the slope ?

Alja [10]

Answer:

5

Step-by-step explanation:

use the formula y2-y1/x2-x1 = 28-18/4-2=10/2=5

4 0

3 years ago

Read 2 more answers

Verify sin(360 - etheta = -sin etheta

Dovator [93]

Answer:

see explanation

Step-by-step explanation:

Using the subtraction identity for sine

sin(a + b) = sinacosb - cosasinb

Given

sin(360 - Θ)°

= sin360°cosΘ° - cos360°sinΘ°

= (0 × cosΘ ) - (1 × sinΘ)

= 0 - sinΘ

= - sinΘ ← as required

8 0

3 years ago