1.(a ^ - 1 + b ^ - 1) / (a + b) 2.Find the value of the following expressions:

a.[{(3-¹)-¹)-¹]-¹

3.If x=3 and y = -2, find the value of x² + y².

4.If 2160 = 2 ^ a * 3 ^ b * 5 degrees , find the value of 3 ^ a * 2 ^ (- b) * 5 ^ (- c)

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6

the answer is simply just 6n add the two together as they have an n

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)