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zimovet [89]
2 years ago
8

What is the solution to the given inequality? 1/2-1/4x>-1/4

Mathematics
2 answers:
dsp732 years ago
7 0

Answer:

x ≤ 3

Step-by-step explanation:

\dfrac{1}{2}-\dfrac{1}{4}x \geq -\dfrac{1}{4}

Subtract 1/2 from both sides:

\implies \dfrac{1}{2}-\dfrac{1}{4}x-\dfrac{1}{2} \geq -\dfrac{1}{4}-\dfrac{1}{2}

\implies -\dfrac{1}{4}x \geq -\dfrac{3}{4}

Multiply both sides by 4:

\implies -\dfrac{1}{4}x \cdot 4 \geq -\dfrac{3}{4} \cdot 4

\implies -x \geq -3

Divide both sides by -1 (remembering to flip the sign):

\implies \dfrac{-x}{-1} \geq \dfrac{-3}{-1}

\implies x \leq  3

Nataly_w [17]2 years ago
3 0
Step 1: Simplify both sides of the inequality.
-1/4 x+1/2 ≥ -1/4
Step 2: Subtract 1/2 from both sides.
-1/4 x+1/2 -1/2 ≥ -1/4 - 1/2
-1/4 x ≥ -3/4
Step 3: Multiply both sides by 4/(-1).
(4/-1)*(-1/4 x) ≥ ( 4/-1)*(-3/4)

The final answer is: x ≤ 3


Hope that helps you<3
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Solve for B and C please :)
lora16 [44]

Part A

h(d) = (-1/5)d^2 + 2d is the same as h(d) = -0.2d^2 + 2d because -1/5 = -0.2

I'll use x in place of d, and y in place of h(d) to get this equivalent equation: y = -0.2x^2 + 2x

Let's find the vertex of y = -0.2x^2 + 2x

Note how y = -0.2x^2 + 2x is in the form y = ax^2+bx+c with

a = -0.2

b = 2

c = 0

So the x coordinate of the vertex is

h = -b/(2a)

h = -2/(2(-0.2))

h = 5

Plug this value into the h(d) function to compute the corresponding y coordinate

h(d) = -0.2d^2 + 2d

h(5) = -0.2(5)^2 + 2(5)

h(5) = 5

Coincidentally, the x and y coordinates of the vertex are both the same. This wont be the case in general.

-----------------

Answers:

The vertex is located at (5,5)

The interpretation is that the highest the dolphin can get is 5 feet off the surface of the water and this occurs 5 horizontal feet away from the starting point. Imagine a parabola that opens downward to have a highest point at the vertex mentioned.

====================================

Part B

From part A above, we found x = 5 to be the x coordinate of the vertex. Simply double this value to get 10 as the answer. The reason why this works is because x = 0 is the starting x intercept, or the starting point which the dolphin jumps from. Also, its because of the hint given how the vertex is between each x intercept.

If the dolphin started from any other point on the x axis, then this trick of "double the result from part A" wouldn't apply.

Part C below shows that x = 0 and x = 10 are the two x intercepts. This helps confirm the proper range.

-----------------

Answer: 10 feet

====================================

Part C

h(d) = y = height of dolphin

we want to find the two x values that make y = 0, which help us figure out when the dolphin jumps out of the water and when it lands back in the water

--------

Plug y = 0 into the equation y = -0.2x^2 + 2x and solve for x

y = -0.2x^2 + 2x

-0.2x^2 + 2x = y

-0.2x^2 + 2x = 0

x(-0.2x + 2) = 0 .... factor out x

x = 0 or -0.2x + 2 = 0 .... zero product property

x = 0 or -0.2x = -2

x = 0 or x = -2/(-0.2)

x = 0 or x = 10

-----------------

Answer:

The two x intercepts are x = 0 and x = 10

This means the parabola crosses the x axis at the locations (0,0) and (10,0).

3 0
3 years ago
Find the solutions. Show steps please!
san4es73 [151]

Answer:

x = 0, π/4, π, 7π/4

Step-by-step explanation:

sin(2x) = √2 sin x

Use double angle formula.

2 sin x cos x = √2 sin x

Move everything to one side.

2 sin x cos x − √2 sin x = 0

Factor.

sin x (2 cos x − √2) = 0

Solve.

sin x = 0, cos x = ½√2

x = 0, π/4, π, 7π/4

6 0
3 years ago
Please please help help me please ASAP ASAP please ASAP thank you!!!!
Natalka [10]

Answer:

1.\frac{10}{1}

2.10

3.\frac{1}{10}

4.\frac{15}{1}

5.15

6.\frac{1}{15}

5 0
3 years ago
Look at points C and D on the graph:
Digiron [165]
5.66 is the answer
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7 0
4 years ago
Read 2 more answers
8/3x + 1/3x = 1 and 1/3 + 7/3x
Jobisdone [24]

Answer:if 8/3x + 1/3x=1, i.e 1/3 +7/3x= 10/9

Step-by-step explanation:

3 0
4 years ago
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