Work out the missing numbers:
a) 1. 6
=
= 0. 04
b) 10. 2
= 0. 8

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

I’m really confused and need your assist me with this question i’ve never been taught

Layla answer 21 of the 25 questions on his history test correctly.what decimal represents the fraction of problem he answer incorrectly.