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jarptica [38.1K]
4 years ago
9

A scuba diver is at the 30-foot level.

Mathematics
1 answer:
Sonbull [250]4 years ago
7 0

Answer:

10 feet

Step-by-step explanation:

Assuming this means below sea level, think of 30 feet as a -30. The destination you need to get to is -20, so you would need to swim up 10 feet.

You might be interested in
The average number of calories in a 1.5-ounce chocolate bar is 225. Suppose that the distribution of calories is approximately n
s344n2d4d5 [400]

Answer:

The probability that a randomly selected chocolate bar will have a. Between 200 and 220 calories will be 0.3023

Step-by-step explanation:

Given:

True mean=225

S.D=10

X1=200 and X2=220

To Find:

P(X1<x<X2)

Solution:

<em>BY using Z-table for probability and Z-score we can proceed.</em>

So

For 200 calories Z will be ,

Z=(sample mean -true mean)/S.D

=200-225/10

=-25/10

=-2.5

For 220 calories Z will be ,

Z=220-225/10

=-5/10

=-0.5

So required probability will be

P(-2.5

=P(-2.5

=P(0>z>2.5)-P(0>z>0.5)

=0.4938-0.1915

=0.3023

6 0
3 years ago
For which k are the roots of k(x2+1)=x2+3x–3 real and distinct?
Ugo [173]

Answer:

The solution for k is the interval (-3.5,1.5)

Step-by-step explanation:

we have

k(x^{2}+1)=x^{2}+3x-3

kx^{2}+k=x^{2}+3x-3

x^{2}-kx^{2}+3x-3-k=0

}[1-k]x^{2}+3x-(3+k)=0

we know that

If the discriminant is greater than zero . then the quadratic equation has two real and distinct solutions

The discriminant is equal to

D=b^{2}-4ac

In this problem we have

a=(1-k)

b=3

c=-(3+k)

substitute

D=3^{2}-4(1-k)(-3-k)\\ \\D=9-4(-3-k+3k+k^{2})\\ \\D=9+12+4k-12k-4k^{2}\\ \\D=21-8k-4k^{2}

so

21-8k-4k^{2} > 0

solve the quadratic equation by graphing

The solution for k is the interval (-3.5,1.5)

see the attached figure

7 0
3 years ago
Consider the function f(x) = mx + b, where m &gt; 0.
Mrac [35]

Answer: A) The x-intercept decreases.

Step-by-step explanation:

Hi, for the function f(x) = mx + b, if the value of b decreases, but the value of m remains the same, The x-intercept decreases.

For example

For b=2, m =1 and x =0 (since the y-value of a linear equation when it crosses the x-axis is 0 )

f(x) =0(1)+2 =2 (x-intercept)

For b= 1 (b decrease) ,m =1 and x =0

F(x) = 0(1) +1 = 1 (x_intercept also decreases)

So, the correct option is A) The x-intercept decreases.

Feel free to ask for more if needed or if you did not understand something.

4 0
3 years ago
Help please, Brainliest asap (EXPLAIN)
Soloha48 [4]

15 + 39 + 22 + 16

54 + 38

92

92/8 = 11.5

Option C., 11.5

8 0
3 years ago
Find the missing digit 20,0_0 is divisible by 6
yan [13]
The missing digit is 0 because it is a divisible of 6
6 0
3 years ago
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