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3 years ago

How do know how many protons are in a atom

Mathematics

2 answers:

katovenus [111]3 years ago

6 0

By the atom's atomic number in the periodic table.

ivann1987 [24]3 years ago

6 0

By the atomic number in the periodic table

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A bulletin board can be covered completely by 30 square pieces of paper without any gaps or overlaps. If each piece of paper has

9966 [12]

Can you help me please I need help with a couple of questions

7 0

3 years ago

A jar contains 8 red marbles and y white marbles. If Joan takes 2 random marbles from the jar, is it more likely that she will h

podryga [215]

Answer:

a) y </= 8 is not sufficient

b) y >/= 4 is sufficient (y is not less than 3.5)

Step-by-step explanation:

Number of Red marbles = 8

Number of white marbles = y

Total number of marbles in the jar = 8+ y

Let Pr(R) be the probability of picking red marbles

Let Pr(W) be the probability picking white marbles

Pr(R) = 8/ (8+y)

Pr(W) = 7/(7+y)

Pr(RR) = Pr(R1) * Pr( R2)

= 8/(8+y) * 7/(7+y)

Pr(RW) = Pr(R1) * Pr(W2) + Pr(W1) * Pr(R2)

= 2[Pr(R1) * Pr(W2)

= 2[8/(8+y) * y/(7+y)]

The probability of having 2 red is greater than one marble of each color.

Pr(RR) > Pr( RW)

8/(8+y) * 7/(7+y) > 2[8/(8+y) * y/(7+y)]

7/(7+y) > 2(y/(7+y)

7/y > 2

7/2 > y

3.5 > y

y < 3.5

Therefore;

a) y </= 8 is not sufficient

b) y >/= 4 is sufficient (y is not less than 3.5)

6 0

3 years ago

Leonard owns a business earning $37,800 in profits. These profits are appreciating at about 2.3% each year. What are Leonard's p

satela [25.4K]

Answer:

B. $45341.60

Step-by-step explanation:

Given:

Initial profit = $37800
Rate of appreciation = 2.3% per year

The equation for this:

$P(t) = 37800*(1 + 0.023)^t = 37800*1.023^t$

Find the value of P(8):

$P(8) = 37800*1.023^8 = 45341.60$

Correct choice is B

3 0

3 years ago

An artist is hired to create an art display for the interior of a city building. The display is to span a total width of 10 yd .

lesya692 [45]

Answer:

8 portraits are going to be used in the display.

Step-by-step explanation:

This problem can be solved as a rule of three problem.

Each yd has 36 inches.

The display is to span a total width of 10 yd. So it is a total width of 360 inches.

Each portrait has a width of 45 in. How many portraits can there be?

1 portrait - 45 in

x portraits - 360 in

$45x = 360$

$x = 8$

8 portraits are going to be used in the display.

7 0

3 years ago

Simplify 0.75 (5v+11)-0.25 (11+v)

SVETLANKA909090 [29]

The answer is 3.5v+5.5

6 0

3 years ago