Step 1: Split the compound inequality into two separate inequalities.
The given inequality is 21(5x−4)≤x+521<3x+121.
This can be written as:
*a) 21(5x−4)≤x+521
*b) x+521<3x+121
Step 2: Solve the first inequality.
21(5x−4)≤x+521
Convert the mixed number to an improper fraction: 521=211.
21(5x−4)≤x+211
Multiply the entire inequality by 2 to eliminate fractions:
2×21(5x−4)≤2×x+2×211
5x−4≤2x+11
Subtract 2x from both sides:
5x−2x−4≤11
3x−4≤11
Add 4 to both sides:
3x≤11+4
3x≤15
Divide by 3:
x≤5
Step 3: Solve the second inequality.
x+521<3x+121
Convert mixed numbers to improper fractions: 521=211 and 121=23.
x+211<3x+23
Multiply the entire inequality by 2 to eliminate fractions:
2×x+2×211<2×3x+2×23
2x+11<6x+3
Subtract 2x from both sides:
11<6x−2x+3
11<4x+3
Subtract 3 from both sides:
11−3<4x
8<4x
Divide by 4:
48<x
2<x
Step 4: Combine the solutions.
From Step 2, we have x≤5.
From Step 3, we have x>2.
Combining these two conditions gives 2<x≤5.
Step 5: Find the integral values of x.
The integral values of x that are greater than 2 and less than or equal to 5 are 3, 4, and 5.
The integral values are 3,4,5.
3 done, 2 left today. You're making progress.