What did is 16=-4x it is for my mathematics class

[] Answer []

[] Explanation []

16 = -4x

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Switch Sides:

-4x = 16

Divide Both Sides By -4:

=

Simplify:

X = -4

1. 5 × $4 = 20
4 ÷ 4 = $1
20 + 1 = $21 

2. 21 ÷ 3 = 7 = 1/3
7 × 2 = 14
7 ÷ 4 = 1.75
1.75 × 3 = $5.25
7 - 5.25 = $1.75 (the answer)

3. I'm going to write an equation for this:
1 dime = 2 nickels
5n + 2n = 175
7n = 175
÷ 7
n = 25
So the nickels are worth 25 cents, which means there are 5 because 25 ÷ 5 = 5. 175 - 25 = 150, 150 ÷ 10 = 15 dimes.
5 nickels and 15 dimes

4. I'm not sure, sorry. I'll look at it again in a few minutes and see if I can complete it