Sonji bought a combination lock that opens with a four-digit number created using the digits 0-9. the same digit cannot be used more than once in the combination.

if sonji wants the last digit to be a 7 and the order of the digits matters, how many ways can the remaining digits be chosen?

a. 84
b. 504
c. 3024
d. 60480

y=x+9

?

step-by-step explanation:

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w