Nadia has 20 more postcards than Pete. After Nadia gives Pete some postcards, Pete has 2 more postcards than Nadia. How many postcards does Nadia give to Pete?

Nadia gave Pete 22 postcards

Step-by-step explanation:

In this question, we are asked to calculate the number of postcards Nadia gave to Pete, given the initial difference between their number of postcards and the later difference after the gifting.

We proceed as follows:

Firstly, we know that Nadia had 20 more postcards than Pete. If we say the variable P should represent the number of post cards Pete had, this means Nadia had a total of 20 + P post cards initially.

Now, Nadia have Pete some number of postcards, let’s say x. This made Pete had two more than Nadia.

Let’s try and come up with mathematical expressions here.

Pete was given some more, meaning want Pete has now is P+x and this is 2 more than what Nadia had initially. This mathematically means;

(P+x) - (P+20) = 2

x -20 = 2

x = 20+2 = 22

This means that Nadia gave Pete 22 postcards

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.