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nikklg [1K]
3 years ago
12

1. SAT Math scores in recent years have had means around 490 and standard deviations

Mathematics
1 answer:
tatiyna3 years ago
3 0

Answer:

´The variance is 10000

Step-by-step explanation:

The variance is defined as the square of standard deviation, consequently it is as follows:

σ^2=100^{2}

σ^2=10000

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Which linear function represents the line given by the point-slope equation y-8=
Nina [5.8K]

Answer:

f(x)=x+4

Step-by-step explanation:

we have

y-8=(x-4)

This is the equation of the line in point slope form

where

The slope is m=1

The point is (4,8)

Convert to slope intercept form

Isolate the variable y

Adds 8 both sides

y-8+8=x-4+8

Combine like terms

y=x+4

Convert to function notation

f(x)=x+4

5 0
4 years ago
The sum of the first 15 terms of a geometric sequence with 7 as the first term and a common ratio of -3 is __________.
Andre45 [30]

Step-by-step explanation:

the formula for the sum of the first n terms of a geometric sequence is

Sn = s1(1 - r^n)/(1 - r)

with r being the common ratio and s1 is the first term.

so,

S15 = 7×(1 - (-3)¹⁵)/(1 - -3) = 7×(1 - -14,348,907)/4 =

= 7×14,348,908/4 = 7×3,587,227 = 25,110,589

4 0
2 years ago
Due to conservation efforts, the gray whale has been removed from the endangered species list. There are now 13,000 in the world
brilliants [131]

Answer:

P = 13,000(1.11) ^ t

Step-by-step explanation:

This scenario can be modeled using an exponential growth equation.

The exponential growth equations have the following form:

P = p (1 + r) ^ t

Where P is the population in year t

p is the initial population at t = 0

r is the growth rate

t is the time in years.

In this case we know that the current population is 13,000 and that the growth rate is 11%

So

p = 13,000\\r = 0.11

The equation that models this scenario is:

P = 13,000(1 + 0.11) ^ t

P = 13,000(1.11) ^ t

4 0
3 years ago
For what value of k does the graph of y = x²-3x-k pass through the point (-1,2)?
gavmur [86]
The value of k should be 2.
 if you plug the y value of the point in the equation for y and do the same with x you should be able to get this answer after fallowing the order of operation.
5 0
4 years ago
Dexter is making a sculpture with
beks73 [17]
To find the surface area of the entire sculpture, you need to add up the surface area of each part of the sculpture.  Overall, you see two triangles connected by two rectangles at the top, and the half of a cylinder at the bottom.

To find the area of one of the two triangles, you use the equation A = (1/2)bh, where b = the base of the triangle and h = the height.  So, the area of one triangle is:

5 0
4 years ago
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