The high tide at midnight was 5.4 feet. the tide went down 3.2 feet at 7am, went up 0.6 feet at 1 pm, and went down 1.1 feet at 8 pm. what was the height of the low tide at 8 pm ?

1.7 feet

Step-by-step explanation:

THe initial height was 5.4 feet

It went down by 3.2 feet, so the new height at 7 AM is:

5.4 - 3.2 = 2.2 feet (at 7AM)

Then, it went up by 0.6 feet at 1PM, so new height is:

2.2 + 0.6 = 2.8 feet (at 1PM)

THen again went down by 1.1 feet, so new height:

2.8 - 1.1 = 1.7 feet (at 8PM)

Hence, the height of the low tide at 8 PM was 1.7 feet

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500