Ask question

Ask question

All categories

erastovalidia [21]

3 years ago

13

In a sample of students, 12 out of 24 students in a class wanted a sandwich for lunch. Using the data from the sample, predict h

ow many students would want sandwiches for lunch in a school of 400

1 answer:

Alona [7]3 years ago

3 0

12 of 24 = 50%

50% of 400 = 200

Your answer is 200.

You might be interested in

Physics students were modeling the height of a ball once it was dropped from the top of a 10 foot ladder. The

julsineya [31]

Answer:

<em>Interval notation: [0, 2.236]</em>

<em>Set Builder notation: </em> $\{t\ |\ 0\le t\le 2.236\}$

Step-by-step explanation:

Given that:

Equation of height of the ball dropped from a height of 10 foot, as:

$h(t) = 10 - 2t^2$

Where $t$ is the time since the ball was dropped.

To find:

The domain of the function in Interval and set builder notation.

Solution:

<em>Domain of a function </em>is defined as the set of valid input values that can be given to the function for which the function is defined.

Here, input is time.

We can not have negative values for time.

Therefore, starting value for time will be <em>0 seconds</em>.

And the value of height can not be lesser than that of 0 ft.

$0= 10 - 2t^2\\\Rightarrow 2t^2=10\\\Rightarrow t^2=5\\\Rightarrow t =2.236\ seconds$

Maximum value for time can be 2.236 seconds.

Therefore the domain is:

<em>Interval notation: [0, 2.236]</em>

<em>Set Builder notation: </em> $\{t\ |\ 0\le t\le 2.236\}$

4 0

3 years ago

Paul needs 40 pounds of 48% silver alloy to finish a collection of jewelry. How many pounds each of 45% silver alloy and 60% sil

Salsk061 [2.6K]

<span>Equation:
silver + silver = silver
0.45x + 0.60(40-x) = 0.48*40
----------------
45x + 60*40 - 60x = 48*40

--------
-15x = -12*40
x = (4/5)40
x = 32 lbs (amt of 45% slloy needed)
40-x = 8 lbs (amt of 60% alloy needed)</span>

8 0

3 years ago

6.4 x 10 to the power of 17

Darya [45]

64

Hope this helps youuuu

4 0

3 years ago

Read 2 more answers

At Quick Lube, 20% of the employees are certified mechanics. If

Marina86 [1]

10 of the employees are certified mechanics.

8 0

3 years ago

It costs $3.45 to buy 2 lbs of chopped walnuts.how much would it cost to purchase 7 lbs of walnuts?

Jobisdone [24]

Answer:

$12.075

Step-by-step explanation:

To find how much one pound of walnuts cost you need to divide 3.45(cost) and 2 (how much) and you get 1.725. That means how much one pound cost ...now that you know that all you have to do is multiply 1.725 by 7. You get $12.075 :)

3 0

3 years ago