Can anyone confirmed and explained 18/19/20

Answer

18) $51

19)  $24

20) Carla's account.

Explanation

18)

Positive sign values means deposit while the negative values means money been withdrawn from the account.

$100 - $18 + $22 - $53 = $51

19)

Positive sign values means money deposited while the negative values means money been withdrawn from the account.

$45 - $17 - $22 + $18 = $24

20)

To get the person with the most deduction, you should add the negative values in the table then compare.

Carla ⇒ -18 + -53 = $-71

Leta ⇒ -17+ -22 = $-39

From here we can see that the account with greatest decrease is Carla's account.

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step-by-step explanation:

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x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15