Since she starts off with 15, u would be subtracting. So she gives 13 to friends. subtract 13. she gives the remaining 2 to teachers. subtract 2. she has 0 left.

5 0

3 years ago

For what value of a does <br> ( 1/9) ^a+1 •27^2-a ?<br><br> O-4<br> O-2<br> O 2<br> O 6

astra-53 [7]

<h2>>>Exponent</h2>

__________

$\:$

$( \frac{1}{9} ) {}^{a + 1} = {27}^{2 - a}$

$( {3}^{ - 2} ) {}^{a + 1} = ( {3}^{3} ) {}^{2 - a}$

$\cancel{ {3}}^{ - 2a - 2} = \cancel{{3}}^{6 - 3a}$

-2a - 2 = 6 - 3a

-2a + 3a = 6 + 2

a = 8✔

6 0

3 years ago

On the basis of data from 1990 to 2006, the median income y in the year x for men and women is approximated by the equations giv

worty [1.4K]

Answer:

2080

Step-by-step explanation:

The solution to these equations might best be found using Cramer's Rule. It tells you ...

x = (56939×3 -41655×2)/(-236×3 +838×2) = 87507/968 ≈ 90.400

This is years after 1990, so the year the incomes become the same is predicted to be ...

1990 +90.4 = 2080.4

The median incomes will be the same in the year 2080.

7 0

4 years ago