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3 years ago

For a brainlist !!!

Mathematics

1 answer:

Llana [10]3 years ago

8 0

Answer:

best answer is correct so C and D

Step-by-step explanation:

d.(0, 4) C. (-1 ,2)

D.0 is less than or equal to 2x-3

0 is than or equal to 5

plugging in others

A. 1 is less than or equal to 2(-1)-3

1 is greater than -5

B. 3 is less than or equal to 2(0)-3

3 is greater than -3

C. -1 is less than or greater to 2(2) -3

-1 is less than or equal to 1

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A forest ranger is in a forest 2 miles from a straight road. A car is located c miles down the road. The forest ranger can walk

Tcecarenko [31]

Answer:

T(x) = (√(4+x^2))/2 +(c -x)/4
(a) x = 1.155 miles
(b) x = 1/2 mile

Step-by-step explanation:

The straight line distance from the starting point to the point x on the road is given by the Pythagorean theorem:

d1 = √(2²+x²)

The time required to walk that distance in the woods (at 2 miles per hour) is ...

time = distance / speed

t1 = √(4+x²)/2

The remaining distance along the road to the car is ...

d2 = c - x . . . . . for c > x

and the corresponding time at 4 mph is ...

t2 = (c -x)/4

Then the total time is ...

T(x) = t1 +t2

T(x) = √(4+x²)/2 +(c -x)/4

(a) The value of x that minimizes total time is the one that makes the derivative zero.

T'(x) = x/(2√(4+x²)) -1/4

0 = (2x -√(4+x²))/(4√(4+x²))

√(4+x²) = 2x . . . . . fraction is zero when numerator is zero; add radical

4 +x² = 4x² . . . . . . square both sides

4/3 = x² . . . . . . . . . subtract x², divide by 3

x = (2/3)√3 ≈ 1.1547

If c = 9 miles, x = 1.1547 miles.

(b) For c < (2/3)√3, the shortest travel time will be along the straight-line path to the car.

If c = 1/2 mile, x = 1/2 mile.

8 0

3 years ago

Please help me ASAP!

Whitepunk [10]

If they are similar, and the second cube's length is 3 times that of the first, then all of the sides are 3 times as large.
To calculate the volume, we multiply the length by the width by the height, each of which is 3 times as big. So, in total, the volume is 27 times larger in the second prism than the first.
So, if the first volume is 30 cubic centimetres, the second one would be 810 cubic centimetres.

Hope I helped! xx

4 0

3 years ago

An F5 tornado is classified as having mean wind speeds greater than 261 mph. In an effort to classify a recent tornado, 20 wind

Anna35 [415]

Answer:

Type 2 error

Step-by-step explanation:

H0 : μ = 261

H0 : μ > 261

By failing to reject H0 ; when the it is false. This means accepting null hypothesis when it is actually FALSE. Then a type 2 error has been committed.

This is different from a type 1 error whereby the null hypothesis is rejected when it is actually TRUE.

Hence, by finding no evidence to reject the null hypothesis during statistical testing when the actual windspeed of an F5 tornado during statistical testing is actually greater than 261 mph.

6 0

3 years ago

Order of operations please help

suter [353]

Greetings!

When solving a math question, we need to follow PEDMAS
Parenthesis
Exponents
Division/Mulitplication
Addition/Subtraction

Example:
$2*3^2-4/(8+2(2))$
Simplify the Parenthesis.
$=2*3^2-4/(8+4)$
$=2*3^2-4/(12)$
Evaluate the Exponents.
$=2*9-4/(12)$
Multiply/Divide from left to right.
$=18-1/3$
$=54/3-1/3$
$=53/3$

Hope this helps.
-Benjamin

7 0

3 years ago

Find the solutions of the inequality. Show your work.<br><br> 4b – 3 > –1

Gwar [14]

So we have to find b we are going to try to isosiate b
4b - 3 > -1 now we are going to isosiate the b so add 3 from both side and get 4b > 2

8 0

4 years ago