Question

ALGEBRA

30. The difference of three times a number and 4 is -19

32. The sum of twice a number and half the number is 10.

34. Four times the difference of a number and 7 is 12.

Answer 1

30. The difference of three times a number and 4 is -19 = 3x - 4 = 19

32. The sum of twice a number and half the number is 10. = 2x + x/2 = 10

34. Four times the difference of a number and 7 is 12. = 4( n - 7 ) = 12

Answer 2

$30)3a-4=-19\\\\ a=-19+4\\\\\\\boxed{a=-15} \\\\\\ 32)2a^{(2}+\frac{a}{2}=10^{(2} \\\\ 4a+a=20\\\\5a=20 \ \ \ |:5 \\\\\\\boxed{a=4}$

$34)4(a-7)=12 \ \ \ |:4\\\\ a-7=3 \\\\ a=3+7\\\\\\\boxed{a=10}$