Answer:
x = 15
Step-by-step explanation:
1. Combine like terms
2x - 3x = -x
2. Rewrite original equation
-x + 4 = -11
3. Subtract four from both sides of the equation.
-x + 4 = -11
- 4 - 4
-x = - 15
4. Divide by -1 on both sides to get rid of the negative signs:
x = 15
Answer:
x = ≈4.78
Step-by-step explanation:
25.1226x / 7.85 = 15.3
25.1226x = 15.3 × 7.85
25.1226x = 120.105
divise by 25.1226 to isolate x
x = ≈ 4.78
Since the person had $408.98 to begin with and took away/withdrawal ($178.67+$100=$278.67) $278.67 and then added/deposited $214.87....
$408.98-$278.67+$214.87=$345.18
81x^4-1=(9x^2-1)(9x^2+1)
=(3x-1)(3x+1)(9x^2+1)
For every 7 boys there are 5 girls.
Divide the number of boys by the ratio for boys: 28 / 7 = 4
Now multiply that by the ratio for girls:
4 x 5 = 20
There are 20 girls.