You have a total of 49 dimes and quarters. you have 7 more quarters than dimes. which system of equations can you use to find the number x of quarters and number y of dimes you have? use the system to determine how much money you have in quarters and dimes.

21 dimes and 28 quarters

Step-by-step explanation:

To determine the number of quarters and dimes that you have, you can write the following equations:

x+y= 49 (1)

y= 7+x (2)

x= number of dimes

y= number of quarters

You have to replace 2 in 1:

x+(7+x)= 49

2x= 49-7

x= 42/2= 21

y= 7+21

y= 28

You have 21 dimes and 28 quarters.

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.

there are no answer choices

step-by-step explanation: