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sveticcg [70]
3 years ago
8

Natasha spent 1 1/2 hours on the beach. She fell asleep for 3/4 of the time she was on the beach and then woke up with a terribl

e sunburn. How many hours was Natasha asleep on the beach?
Mathematics
2 answers:
earnstyle [38]3 years ago
8 0

Answer:

1 and 1/8

Step-by-step explanation:

Elina [12.6K]3 years ago
6 0

Answer:

Natasha fell asleep for 1.125 hours.

Step-by-step explanation:

We have been given that

Total time spent by Natasha on the beach = 1 1/2 = 3/2 hours

She fell asleep for 3/4 of time she was on the beach.

Hence, the time she fell asleep is given by

t=\frac{3}{2}\times\frac{3}{4}\\\\t=\frac{9}{8}\\\\t=1.125\text{ hours}

Therefore, Natasha fell asleep for 1.125 hours.

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Please help me!<br> Find the number x such that f(x) =1
STatiana [176]

Answer:

D

Step-by-step explanation:

We have the piecewise function:

f(x) = \left\{        \begin{array}{ll}            -\frac{1}{2}x-1 & \quad x \leq -2 \\            x & \quad x > -2        \end{array}    \right.

And we want to find x such that f(x)=1.

So, let's substitute 1 for f(x):

1 = \left\{        \begin{array}{ll}            -\frac{1}{2}x-1 & \quad x \leq -2 \\            x & \quad x > -2        \end{array}    \right.

This has two equations. So, we can separate them into two separate cases. Namely:

1=-\frac{1}{2}x-1\text{ or } 1=x

Let's solve for x in each case.

Case I:

We have:

1=-\frac{1}{2}x-1

Add 1 to both sides:

2=-\frac{1}{2}x

Let's cancel out the fraction by multiplying both sides by -2. So:

2(-2)=(-2)\frac{-1}{2}x

The right side cancels:

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Flip:

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So, x is -4.

Case II:

We have:

1=x

Flip:

x=1

This is the solution for our second case.

So, we have:

x_1=-4\text{ or } x_2=1

Now, can check to see if we have to to remove solution(s) that don't work.

Note that x=-4 is the solution to our first equation.

The first equation is defined only if x is less than -2.

-4 <em>is </em>less than -2. So, x=-4 is indeed a solution.

x=1 is the solution to our second equation.

The second equation is defined only if x is greater than or equal to -2.

1 <em>is</em> greater than or equal to -2. So, x=1 is <em>also </em>a solution.

Therefore, our two solutions are:

x_1=-4\text{ or } x_2=1

Out of our answer choices, we can pick D.

And we're done!

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3 years ago
which of the following best describes the technique used to graph the equation using the slope and y-intercept ? Y=5x+10
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Solve the system of equations<br> 3x+4y+12<br> 9x-2y=15
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3x+4y=12
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we will use elimination
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x=2

x=2
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3 0
3 years ago
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