Martin had m dollars initially. first, martin spent 1/3 of his money. then martin spent 3/4 of what was left. finally, martin spent another $20. write an expression in terms of m for the final amount of money that martin has. then write another equivalent expression. explain.

First Method

First, he had M some unknown amount 

Then, he had 2/3 M since he spent 1/3 M

Then, he spent 3/4 of the (2/3 M) so he had 1/4 of the ( 2/3M) 

Then, he spent what was left $20 so $20 = 1/4 ( 2/3 M) now solve for M

You can check by doing each step and figuring how much was spent and how much was left.

Second Method

let us consider the left amount be Y and total now of M dollar be X

Y = amount of money Nartin has left 

Y = X - ( 1/3 ) ( X ) - ( 3/4 ) ( X - 1/3 X ) - 20 

Y = X - 1/3 X - 3/4 X + 3/12 X - 20 

Y = X - 4/12 X - 9/12 X + 3/12 X - 20 

Y = X - 10/12 X - 20 

Y = X - 5/6 X - 20 

Y = ( 1 / 6 ) ( X ) - 20 

Hope this helps.

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.

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.