Aperson has 22 coins, all nickels and dimes, worth one dollar and 40 cents. if n is the number of nickels and d is the number of dimes, which system of equations could represent this problem?
n+d=1.40
0.05n+0.1d=22
n+d=22
n+d=1.40
n+d=22
0.05n+0.10d=1.40

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

10.4 inches

step-by-step explanation:

2x2x2.6