Answer:
C. x > -7 and x <= 3
Step-by-step explanation:
-3 < x + 4 <= 7
Subtract 4 from the three expressions.
-7 < x <= 3
-7 < x means x > -7.
Then you have x <= 3.
Answer: C. x > -7 and x <= 3
Answer:
x = 8
y = 3
Step-by-step explanation:
Area = 1/2 √6 (6√2 + √8) Remove the brackets
Area = 1/2 ( 6*√12+ √48)
Area = 1/2 (6*√12 + 4√3) Multiply by 1/2
Area = 3√12 + 2√3
Area = 3*2√3 + 2√3
Area = 6√3 + 2√3
Area = 8√3
- 05.52 because it has a limited amount
Total miles = 70 + 70 = 140 miles
Total time = 140 miles / 57 mph = 2.456 hours
Time 1: 70 miles / 70 mph = 1 hour
Time 2: 70 miles / x mph
Total time = time 1 + time 2:
2.456 = 1 hour + 70/x
Subtract 1 hour from both sides:
1.456 = 70x
multiply both sides by x:
1.456x = 70
Divide both sides by 1.456:
x = 70/1.456
x = 48.0769 miles per hour
Rounded to 2 dp = 48.08 miles per hour
