Write an algebraic expression for each phrase.

y plus twelve is twenty.

six more than twice a number.

seven less than k.

seven more than twice a number is one.

the difference of x and eight is equal to fifteen.

2x + 6, there is a word than which means that the first given(six) should change place with the second given(twice a number), more than is equivalent to addition (+)

for twice a number, twice means 2 and a number is and letter or variable, so this means that 2 is being multiblied with any letter or variable.

k - 7, the word than is present again so intherchange the given, less than is equivalent to subtraction (-)

2x + 7 = 1

x - 8 = 15, difference is equivalent to subtraction