What is the value o(f 5.3 * 10^4 ) ( 4.2*10^3) in scientific notation?

( 5.3 * 10^4 ) ( 4.2*10^3)

Multiply the numbers and add the exponents

(5.3 * 4.2) * 10 ^ (4+3)

22.26 * 10^7

now we have to adjust since more than 1 number is in front of the decimal

2.26 * 10^(7+1)

2.26*10^8

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