What is the value of x, if the equation 2(x + 60) + 2(30) = 200

X= -530

This is because:

2(x+60)+2(30)=200
•distribute the 2s into each parentheses
2x+1200+60=200
•combine like-terms
2x+1260=200
•isolate 2x by subtracting 1260 from both sides of the equation
2x=200-1260
•subtract 1260 from 200
2x= -1260
•divide both sides by 2 so you can have x all alone
2x/2= -1260/2
Hence
x= -530

D. Kilometres makes more sense

Step-by-step explanation:

Given

d = rt

d = 800,000 metres

t = 4 hours

Required

Answer Part A to D

A. Rearrange the formula;

Here, we simply divide both sides by t

Reorder

B. Solve for r in metres per hour

Here, d = 800,000 metres and t = 4 hours

becomes

C. Solve for r in kilometre per hous

We start by converting d = 800,000 metres to kilometres

If , then

So, and

becomes

D. Which unit makes more sense

As a standard, when calculating speed or velocity, metres is used viz a viz seconds while kilometres is used along with hours;

Since, the first unit (metres) is best used with seconds and the second unit (kilometre) is best used with hours, it's safe to conclude that kilometres makes more sense