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sesenic [268]
3 years ago
7

An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom hav

e?
A.30
B.35
C.65
D.95
Mathematics
1 answer:
777dan777 [17]3 years ago
4 0

the answer is A)30

Hope it helps

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-2(x+5)=4 Can someone explain I need an one number answer.
Irina18 [472]

Answer:

7

Explanation:

−

2

x

+

10

=

−

4

take 10 from both sides

−

2

x

=

−

14

divide both sides by -2 to find x

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=

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Step-by-step explanation:

7 0
3 years ago
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Write 0.39 as a fraction in simplest form
nika2105 [10]
Here's how to convert 0.39 to a fraction...

There is not much that can be done to figure out how to write 0.39 as a fraction, except to literally use what the decimal portion of your number, the .39, means.

Since there are 2 digits in 39, the very last digit is the "100th" decimal place.

So we can just say that .39 is the same as 39/100.

So your final answer is: 0.39 can be written as the fraction 39/100 (ALREADY SIMPLIFIED)

3 0
3 years ago
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Travis spies an owl in a tall tree. He estimates the height of the tree to be 85 feet and the angle of elevation to the bird fro
anyanavicka [17]

Answer:

63.44 feet

Step-by-step explanation:

tan(68 degrees)= 85/y  

y tan (68 degrees)=85

y=85/tan(68 degrees) ( cross multiply)

y = 34.34 feet

tan (41 degrees)=85/x+y

(x+y)tan(41 degrees)=85

x+y=85/tan 41 degrees

x=85/tan(41 degrees) - y

x= 85/tan (41 degrees)-(34.34) (cross multiply)

Therefore, Travis stepped back 63.44 feet to gain a better view!

7 0
3 years ago
What are the x-intercept and y-intercept of the graph of y=13x−6 ?
gtnhenbr [62]
To find the x-int., let y = 0 and solve for x:  13x = 6, so x = 6/13:  (6/13, 0)

To find the y-int., let x =0 and read off the y-int:  (0, -6)
7 0
3 years ago
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What is the line of reflection?
Naily [24]

Answer:

Y Axis

Step-by-step explanation:

The y axis is the best so it reflects off of both sides of the best axis in the world.

6 0
3 years ago
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