What is m a ?

a. 42

b. 50

c. 58

d. 100

i think its a or c not sure tho

Angle A = 58

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the opposite interior angles

? + 80 = 138

Subtract 80 from each side

? + 80-80 =138 - 80

? = 58

Angle A = 58

, 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

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25