Can someone answer these two I am not understanding my math

Algebra 1

Estimate each quotient. show the compatible numbers you use. 0.00438 ÷ 0.00072

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1