Answer:
Step-by-step explanation: please go through the attached file for detailed explanation .
The range is subtracting the lowest number in the data set from the highest number in the data set.
25.
A. 6.5-0 = 6.5
B. 6 - 0.5 = 5.5
C. 6.5 - 0.5 = 6
D. 6.5 - 0.5 = 6
26.
Highest time: 26:10
Lowest time: 20:58
Range = 26:10 - 20:58 = 5 minutes, 12 seconds
What you can do is multiply the whole first equation by 12, so 6x + 26.4y = 108.
then since the coefficients of the x value (the number in front of the x) are the same in both equations, you can subtract the second equation from the first:
6x + 26.4y = 108
-(6x + 0.4y = -22)
26y = 130 divide by 26
y = 5
you can then plug y=5 into one of the equations to solve for x:
0.5x + 2.2(5) = 9
0.5x + 11 = 9 subtract 11 from both sides
0.5x = -2 multiply each side by 2
x = -4
They both can be divided by 2 to make it 7: 28. Then, it can be divided by 7 to make it 1:4
Answer:
-509
Step-by-step explanation:
1. Subsitute 5 for a in the expression. -6(5)^3+8(5)^2+8(5)+1
2. -6(125)+8(25)+40+1
3. -750+200+41
4. -509
