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kherson [118]
3 years ago
13

During a scuba dive, Lainey descended to a point 20 feet below the ocean surface. She continued her descent at a rate of 20 feet

per minute. Write an inequality you could solve to find the number of minutes she can continue to descend if she does not want to reach a point more than 100 feet below the ocean surface.
Mathematics
2 answers:
MatroZZZ [7]3 years ago
8 0
She can descend five minutes so that should help
Rainbow [258]3 years ago
8 0

Answer:

We know that she first descends 20 feet, and then she descends at a rate of 20 feet per minute. Basically, we have 20 feet which have to me summed with 20x, which expresses the ratio per minute, where x is minutes, and these terms cannot be more than 100 feet, so there are equal or less than 100 feet,

The expression would be:

20+20x\leq 100

If we solve this, we have

20+20x\leq 100\\20x\leq 100-20\\x\leq \frac{80}{20}\\ x\leq 4

Therefore, she cannot descent for more than 4 minutes.

You might be interested in
Which expression is equivalent to -5a + 12b - c + 5a - 7b + 12c after combining like terms?
just olya [345]

Answer:

5b + 12c

Step-by-step explanation:

-5a +5 a = 0

12b-7b = 5b

12c= 12c

therefore you have the expression 5b+12c

4 0
3 years ago
2. P337. 23. A large box contains 10,000 ball bearings. A random sample of 120 is chosen. The sample mean diameter is 10 mm, and
Rashid [163]

Answer:

B is True

A, C. D are false

Step-by-step explanation:

Given :

Sample size, n = 120

Mean diameter, m = 10

Standard deviation, s = 0.24

Confidence level, Zcritical ; Z0.05/2 = Z0.025 = 1.96

The confidence interval represents how the true mean value compares to a set of values around the mean computed from a set of sample drawn from the population.

The population here is N = 10000

To obtain

Confidence interval (C. I) :

Mean ± margin of error

Margin of Error = Zcritical * s/sqrt(n)

Margin of Error = 1.96 * 0.24/sqrt(120)

Confidence interval for the 10,000 ball bearing :

10 ± 1.96 * (0.24) / sqrt(120)

Hence. The confidence interval defined as :

10 ± 1.96 * (0.24) / sqrt(120) is the 95% confidence interval for the mean diameter of the 10,000 bearings in the box.

4 0
3 years ago
What am i supposed to do??
miskamm [114]
Exterior angle theorem
16x - 7 = 8x + 2 + 10x - 19    ===>  16x -7 = 18x - 17
16x - 16x - 7 = 18x - 16x - 17 ===> -7 = 2x - 17
-7 + 17 = 2x - 17 + 17             ===> 10 = 2x ======> 5 = x
Plug x in to each equation.
Angle P: 8(5) + 2 = 42 deg, Angle Q: 10(5) - 19 = 31
The sum of interior angles = 180. 180 - 42 -31 = 107 deg (angle of PRQ)
To check that line other angle : 16(5) -7 = 73 deg + 107 = 180 deg


5 0
3 years ago
Which plane contains points E, F, and D?
Aleks04 [339]

Answer:

none of the above? sorry not too sure

5 0
3 years ago
Please answer this question!
Aleks [24]
406 divided by 140 makes 2.9 multiply that 100 and you arrive at 290%. Hope this helps!
8 0
3 years ago
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