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3 years ago

8

The depth, d , in inches of the water in a tidal pool, is modeled by the function d=−2x2+12x+7, where x is the number of hours s

ince noon.

1 answer:

blsea [12.9K]3 years ago

6 0

Answer: 23x

Step-by-step explanation:

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.Write the equation of the line that passes through (5,0) and is perpendicular to the line y = 5x + 55.

Pavlova-9 [17]

Answer:

y=-1/5 x+c

0=-1/5(5)+c

0=-1+c

1=c

y=-1/5x+1

Step-by-step explanation:

6 0

3 years ago

Adam is n years old . Mary Beth is 3n + 4 years old . If Adam is 9 years old, how old is Mary Beth?

Rzqust [24]

Answer: Brailiest plz?

31

Step-by-step explanation:

(3)(9)+4=31

7 0

3 years ago

I put $500 in a saving account that earns 6% interest compounded semi-annually. How much interest will be in the account after 2

Nuetrik [128]

$\bf ~~~~~~ \textit{Compound Interest Earned Amount}
\\\\
A=P\left(1+\frac{r}{n}\right)^{nt}
\quad 
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\to &\$500\\
r=rate\to 6\%\to \frac{6}{100}\to &0.06\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{semi-annually, thus twice}
\end{array}\to &2\\
t=years\to &2
\end{cases}
\\\\\\
A=500\left(1+\frac{0.06}{2}\right)^{2\cdot 2}\implies A=500(1.03)^4\implies A=562.754405$

now, "A" is the accumulated amount, including the earned interest, how much interest was it earned? well, is just A - P.

3 0

3 years ago

I need help with this asap! will give brainiest if answered correctly

gulaghasi [49]

Answer:

Step-by-step explanation:

2

6 0

3 years ago

Two friends, Darren and Michael, together earn $30 more than twice what Brian earns per month. If Darren and Michael together ea

kumpel [21]

Lets assign some variables: Let
y = Darren + Michael
x = Brian.
Given:
y = 2x + 30 (Darren and Michael [y] earn [=] 30 more than[+30] twice what Brian earns[2x])
y = 3800 (Darren and Michael [y] earn [=] $3800)
Solve for x: What Brian earns.

I will solve this by substitution. Plugging in 3800 for y:
3800 = 2x + 30 subtract 30 from both sides
3770 = 2x divide by 2 on both sides
1885 = x flip the equation
x = 1885
Brian earns $1885 per month.

4 0

3 years ago