Solve the following equations using any method. Show your work and check your solution.
a. 5 + 12 = 42
b. 4( − 3) = 40
c. 2 − 6 + 2 = 10 + 4 − 16
d. 3 + 5 = 3 − 7
Only reply if you have the answer

the first one is false

the second one is false

the third one is true

the last one is false

20

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for