Hello, can someone explain how to find these? you so much from the bottom of my heart!

add or subtract in each case. write all fraction answers as mixed numbers. place a space between the whole number and the fraction.

1: 5.8 + (-8.45)
2: -3/4 + 7/8
3: -13.62 - (-27.9)
4. -3 2/5 - 4 1/2

(a) –2.65

(b) 1/8

(c) 14.28

(d) –7 9/10

Step-by-step explanation:

(a) 5.8 + (–8.45) = 5.8 – 8.45 = –2.65

(b) –3/4 + 7/8 = –6/8 + 7/8 = 1/8

(c) –13.62 – (–27.9) = –13.62 + 27.9 = 14.28

(d) –3 2/5 – 4 1/2 = –17/5 – 9/2 = –34/10 – 45/10 = –79/10 = –7 9/10

10 cm

step-by-step explanation:

if the polygon is a rectangle, then the perimeter is x+x+y+y. using the values that you gave, the perimeter is 3+3+2+2=10cm.

8

step-by-step explanation:

just put √(2) * √(32) into a calculator. that will make the answer be 8.