Which sentences represent the inequality? Check all that apply. 2.1 + (-1.2x) Greater-than-or-equal-to 8
The sum of 2.1 and –1.2 times a number is at least 8.
The sum of 2.1 and –1.2 times a number is no more than 8.
The sum of 2.1 and –1.2 times a number is a maximum of 8.
The sum of 2.1 and –1.2 times a number is greater than or equal to 8.
The sum of 2.1 and –1.2 times a number is a minimum of 8.

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

the correct answer is c

3boys + 4 girls = 7 students

3 boys to students   true   yes

4 girls to 3 boy   true     yes

3 boys to 7 girls   false   no

4 girls to 7 students   true   yes