Which of the following expressions is not correctly written in scientific notation?
a. 1 × 10^4
b. 9 × 10^2
c. 10 × 10^7
d. 5 × 10^3

step-by-step explanation: noo

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation: