Urgent i am being timed

one last one: simplify and solve for the unknown. use the additive and multiplicative inverses. type your full answer in the box, using the variable and an equal sign. do not add spaces.
2(a + 4) + 6a = 2(2 + 3a)

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6

Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?

Find the value of the combination. 5 c 5