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3 years ago

Can you help me with these please 30 points

Mathematics

2 answers:

Solnce55 [7]3 years ago

8 0

Answer:

1 c

2 b

3 a

Step-by-step explanation:

1 Density is a physical property that is specific for all elements. Density is a calculation of Mass divided by volume.

2 b i think because the questions ask if it will sink or float

3 because anything that has a volume of 1g or more will sink because water is 1g

garik1379 [7]3 years ago

3 0

Answer: 1. densities

2. i don’t have the passage but i assume it to be A or D

3. it will sink so A

Step-by-step explanation:

the density must be lower than 1 g/cm3 for it to float

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I need help with this.

luda_lava [24]

Answer:

12 mm

Step-by-step explanation:

Use Pyth Theor

9^2 + b^2 = 15^2

81 + b^2 = 225

b^2 = 144

sqrt 144 = 12

b = 12

5 0

2 years ago

Read 2 more answers

The initial water level of a darn is 35 meters and decreases at a rate of 0.7 meters per day.

sdas [7]

Answer:

Step-by-step explanation:

5 0

3 years ago

Water whose temperature is at 100∘C is left to cool in a room where the temperature is 60∘C. After 3 minutes, the water temperat

Tju [1.3M]

Answer:

21.68 minutes ≈ 21.7 minutes

Step-by-step explanation:

Given:

$T=60+40e^{kt}$

Initial temperature

T = 100°C

Final temperature = 60°C

Temperature after (t = 3 minutes) = 90°C

Now,

using the given equation

$T=60+40e^{kt}$

at T = 90°C and t = 3 minutes

$90=60+40e^{k(3)}$

$30=40e^{3k}$

$e^{3k}=\frac{3}{4}$

taking the natural log both sides, we get

3k = $\ln(\frac{3}{4})$

3k = -0.2876

k = -0.09589

Therefore,

substituting k in 1 for time at temperature, T = 65°C

$65=60+40e^{( -0.09589)t}$

$5=40e^{( -0.09589)t}$

$e^{( -0.09589)t}=\frac{5}{40}$

$e^{( -0.09589)t}=0.125$

taking the natural log both the sides, we get

( -0.09589)t = ln(0.125)

( -0.09589)t = -2.0794

t = 21.68 minutes ≈ 21.7 minutes

6 0

3 years ago

In angle abc , m angle A =x , m angle B =2x+2, m angle C = 3x+4.what is value x

Morgarella [4.7K]

A + B + C = 180
x + 2x + 2 + 3x + 4 = 180
6x + 6 = 180
6x = 174
x = 29

8 0

3 years ago

An isosceles trapezoid with a perimeter of 42 inches. Each of the congruent non parallel sides is 5 inches long, and the trapezo

Ratling [72]

Answer:

Longer - 20 in and Shorter - 12 in

Step-by-step explanation:

We know that when we subtract the shorter side from longer we get two cuts named x:

2 x = a - b => a - b = 2 x

One of this section ( x ) with height ( h ) and lateral (congruent non parallel) side ( c ) make right triangle, from which we get:

x² = c² - h² and c = 5 in, h = 3 in

x² = 5² - 3² = 25 - 9 = 16 => x = √16 = 4 => x = 4 in

Now we will replace x = 4 in the equation a - b = 2 · 4 = 8 and get first equation of the system.

a - b = 8

We also know that the formula for calculating perimeter is:

P = a + b + 2 c where P = 42 in and c = 5 in

a + b = 42 - 2 · 5 = 42 - 10 = 32

Now we get the second equation of the system:

a + b = 32

a - b = 8

When we add first equation to the second we get:

2 a = 40 => a = 40 / 2 = 20 => a = 20 in

When we replace a = 20 in the first equation we get:

20 + b = 32 => b = 32 - 20 = 12 => b = 12 in

God with you!!!

8 0

3 years ago