Answer: The value of x is 2
Step-by-step explanation:
x + 7 =3x + 3
-x -x
7= 2x + 3
-3 -3
4= 2x
x= 2
Answer:
8.5
Step-by-step explanation:
Let the three numbers be x, y and z. Then x+y+z=75.
z = 2x. y = x - 9.
Eliminate y and z by substitution: x + (x - 9) + (2x) = 75
Then 4x = 75 + 9, or 4x = 84. x = 21, y = 21 - 9 = 12, and z = 2(21) = 42.
Check: Do 21, 12 and 42 add up to 75?
If you have a graphing calculator (such as a TI-84), you can use the normalcdf feature by clicking on the blue "2nd" button, then the "vars" button and then choice 2. Since you are finding the proportion of hybrids that get over 61 mpg, the lower bound is 61, the upper bound is infinity (you can type in 99999), the mean is 57, and the standard deviation is 3.5. So... normalcdf(61,99999,57,3.5) = .1265. This means that 12.65% of the hybrids get over 61 mpg.
1. 9
2. x = 7
3. 12
4. 7.12
5. 3
6. 1.2
7. 41.48
8. I cant see the numbers, can you make the photo bigger
9. again i cant see, can you make it bigger
10. 37,260
16. 7.4
