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3 years ago

Hi I really need help with this question. SHOW YOUR WORK IF YOU ARE WILLING TO HELP ME TY! <3

Mathematics

1 answer:

Ulleksa [173]3 years ago

6 0

Answer:

8.9

Step-by-step explanation:

Parenthesis are always first so,

4.5+7.6=12.1

so the problem would look like this now:

12.1-8/2.5

so convert 8/2.5 to 8÷1/5÷2 so this will become 16/5

16.5 concerted to decimal=3.2

so 12.1-3.2=8.9

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I don’t understand please help

Nesterboy [21]

Answer:guess

Step-by-step explanation:

5 0

3 years ago

QUICK!!! PLEASE HELP!!! 50 points.. and BRAINLIEST FOR THE QUICK AND CORRECT ANSWER.

faust18 [17]

Answer: $e=-50|t-40|+2000$

The cable car’s elevation will be 750 feet after 15 minutes or 65 minutes.

Step-by-step explanation:

Given: A cable car begins its trip by moving up a hill. As it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet.

Then, total time taken to reach the peak = (Distance) ÷ (speed)

= (2,000 feet) ÷ ( 50 feet/minute)

= 40 minutes

Then, as the car moves down to the hill’s base, its elevation drops at the same rate.

The equation that models the cable car’s elevation, e, after t minutes is

e= (constant rate)|t- time to reach peak |+ Peak's height

$e=-50|t-40|+2000$

When the cable car’s elevation will be 750 feet after minutes, then we have

$750=-50|t-40|+2000\\\\\Rightarrow\ -50|t-40|=750-2000\\\\\Rightarrow\ -50|t-40|=1250\\\\\Rightarrow|t-40|=-\dfrac{1250}{50}\\\\\Rightarrow|t-40|=-25\\\\\Rightarrow t-40=-25\text{ or }t-40=25\\\\\Rightarrow t=-25+40\text{ or }t=25+40\\\\\Rightarrow t=15\text{ or }t=65$

Time cannot be negative, so the cable car’s elevation will be 750 feet after 15 minutes or 65 minutes.

5 0

3 years ago

Which statements about a square are always true?

arlik [135]

Answer:

All statements are true.

Step-by-step explanation:

In a square, we have

all sides equal

all angles equal to 90 degrees

diagonals always bisect each other and at right angles.

Only square is the quadrilateral which satisfies all the above properties.

A parallelogram has diagonals which do not cut at right angles.

A rhombus has all sides equal but not all angles. Neither diagonals are equal in a rhombus.

8 0

3 years ago

Catalina scored a total of 34.9 points in her gymnastics events last week. This week she had 26.1 points with one event remainin

masya89 [10]

Given that last week's points is 34.9 and this week's is 26.1, let p be the number of points she must score in order to have the same score as last week or more, then the inequality will be given by summation of today's points:
p+26.1>34.9

Answer:
<span>A. p + 26.1 > 34.9</span>

4 0

3 years ago

11000 is compounded semiannually at a rate of 12% for 21 years. Find the total amount in the compound interest account

marishachu [46]

$\bf ~~~~~~ \textit{Compound Interest Earned Amount}
\\\\
A=P\left(1+\frac{r}{n}\right)^{nt}
\quad
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\dotfill &\$11000\\
r=rate\to 12\%\to \frac{12}{100}\dotfill &0.12\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{semiannually, thus twice}
\end{array}\dotfill &2\\
t=years\dotfill &21
\end{cases}$

$\bf A=11000\left(1+\frac{0.12}{2}\right)^{2\cdot 21}\implies A=11000(1.06)^{42}\implies A\approx 127127.359416$

5 0

4 years ago