Lin had $80 in her saving account. She used her debit card to make 3 purchase of $30 per purchase. How much was left in Lin's saving account?

-$10

Step-by-step explanation:

what we know:

$80 in savings

spends $30 for 3 payments

Equation:

30 x 3 = $90

80 - 90 = -$10

but if you meant the saving account was not in her debit then you wont know the amount:)

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%