Please help if you are good in geometry!!

im going to fail my takehome test and i'm already doing bad in this class!
if anyone can help that would be so great!
5. Find the length of a side of the rhombus whose diagnals measure 12 and 16

7. In quadrilateral ABCD measure of A= 57, measure of B =65, and measure of C =118. What is the measure of an exterior angle at D?

10. In triagnle ABC, AC is extended through C to D. If measure of BAC = 6x+10, measure ABC= 6x-10, and measure BCD= 8x+20 find x

12. In ABC measure of A = 35 and measure of C=77. Which is the longest side of the triangle?

13. Find the length in radical form of a diagonal of the square whose side is 10.

14. Under a translation the image of point (3,2) is (-1,3). What are the coordinates of the image of point -2,6) under the same translation?

17. If two angles of a triangle measure 43 degrees and 48 degrees the triangle is
a. actue
b. obtuse
c, isosceles
4. right
if anyone can help me i would appreciate it soooo much! and if you can explain the work that would be great too!

Haven't had Geometry for a long time but the book that contained our homework had everything we needed to know and explained every type of problem related to Geometry. If you have one, I would check it. Also I believe number 17 is obtuse but I'm not positive.

Obtuse angle square root of the pythagorean theorem times ten divided by infinity.