**Answer:**

im pretty sure...

15m+5n

**Step-by-step explanation:**

you multiply 5&3 and since there is no number by the variable n just put 5 by it...

**Answer: **x = 120 y = 25 z = 35

**Step-by-step explanation:**

z = 35 because of the Z rule

y = 25 because y + 35 = 60

x = 120 because of the C rule

Sorry if you don't understand, I don't know how to explain the reason to the answers

**Answer: x = -4**

**Step-by-step explanation:**

-4 + 4 = 0

if y = 0 then X will be -4

**Answer:**

SEE BELOW

**Step-by-step explanation:**

1. find value of m

a^2 + b^2 = c^2

7.5^2+10^2=c^2

15+100=c^2

115=c^2

square it

=10.7 (not answer)

a^2+b^2=c^2

10.7^2+30^2=c^2

114.49+900=c^2

1014.49=c^2

square it

m=31.9

2.20^2 + 21^2 = 841

29^2=841

yes the triangle is right angled !!!

hope this helps :)

**Answer:**

You basically just go by these steps: In mathematics, the additive inverse of a number a is the number that, when added to a, yields zero. This number is also known as the opposite (number), sign change, and negation. For a real number, it reverses its sign: the opposite to a positive number is negative, and the opposite to a negative number is positive. So you do the same with 8 and then the 5 and boom your answer is there its simple.

Hope I helped!