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Leto [7]
3 years ago
8

10% of Kindergarteners know how to read before school starts. If there are 150 kindergarteners at a

Mathematics
2 answers:
Natasha_Volkova [10]3 years ago
7 0
10% = 0.10

0.10 x 150 = 15

So 15 kids are able to read on the first day of school!
Tamiku [17]3 years ago
3 0

Answer:

15

Step-by-step explanation:

To get 10 percent, you divide by 10.

150 divided by 10 equals 15.

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A screening test for a disease shows a positive result in 91% of all cases when the disease is actually present and in 7% of all
Jobisdone [24]

Answer:

0.0713 = 7.13% probability that the result is positive.

Step-by-step explanation:

Probability of a positive test:

91% of 1/650(has the disease).

7% of 1 - 1/650 = 649/650(does not have the disease). So

p = 0.91\frac{1}{650} + 0.07\frac{649}{650} = \frac{0.91 + 0.07*649}{650} = 0.0713

0.0713 = 7.13% probability that the result is positive.

4 0
2 years ago
The function f is continuous on the closed interval [1,15] and has the values shown on the table above. Let g(x) = ∫f(t) dt [1,x
Anna11 [10]
We're looking for the two values being subtracted here. One of these values is easy to find:

<span>g(1) = ∫f(t)dt = 0</span><span>
since taking the integral over an interval of length 0 is 0.
 
The other value we find by taking a Left Riemann Sum, which means that we divide the interval [1,15] into the intervals listed above and find the area of rectangles over those regions:

</span><span>Each integral breaks down like so:

(3-1)*f(1)=4

(6-3)*f(3)=9

(10-6)*f(6)=16

(15-10)*f(10)=10.

So, the sum of all these integrals is 39, which means g(15)=39.
 
Then, g(15)-g(1)=39-0=39.
</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
3 0
3 years ago
Read 2 more answers
Find the area of circle o if DCBO is a rectangle and DB measure 10 units
Dmitrij [34]

Answer:

100\pi

Step-by-step explanation:

Step 1: Identity the radius.

Since O is the center of the circle, and C and E lie on the circumference, OC and OE are the radii of the circle and thus,

OC=OE.

Step 2: Consider the rectangle.

All diagonals in a rectangle are congruent so this means

DB= OC ( OC is also a diagonal).

Thus, OC= 10 units.

Step 3: Analyze

So this means OE is also 10 units as well.

Since we know the length of the radius, Use the area of circle,

\pi {r}^{2}

\pi( {10}^{2} ) = 100\pi

So the area of a circle is 100 pi.

3 0
2 years ago
Read 2 more answers
*there is a picture* how do you solve this? Explain please!
emmasim [6.3K]
350 more compact car spaces are available

2/5 = 0.4 = 40%
40% of 1,000 is 400
400 spots are for compact cars

On Tuesday tner were 150
So there is 350. more spots available 400-150 = 350
4 0
3 years ago
Select the 2 expressions that would be equivalent to the following:
evablogger [386]

Answer:

D. -2(x + 7)

Step-by-step explanation:

3 0
3 years ago
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