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Marta_Voda [28]
3 years ago
7

6. Select all the inequalities that have the same solutions as -4x < 20.

Mathematics
1 answer:
attashe74 [19]3 years ago
7 0

Answer:

F and B (as far as I can see).

Step-by-step explanation:

First, let's simplify the equation. You can easily do this by dividing by -4.

                                                  -4x < 20

                                                   /-4    /-4

                                                      x > -5

REMEMBER- Whenever dividing or multiplying a negative number with inequalities, the sign flips!!

On A, we can see that it has a negative symbol, but if we were to divide that, the sign would flip, making -5 greater than x. That's not what we want.

On B, the 20 is negative instead of the 4. Does this change anything?

                                                   4x > -20

                                                   /4    /4

                                                      x > -5

Nope! It still simplifies to what we had at the beginning so it works!

C and D are slightly confusing me because, well, I don't really see how it's relevant to anything so... It doesn't even have a inequality symbol so I don't know lol.

E is wrong because we need the 5 to be positive.

F is obviously right compared to our first answer.

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Answer please will mark brainiest if right and give 30 points
sveta [45]

The correct options are options B and C.

Percentage increases/decreases can be found using multiplication, you can't find 8% higher than T using addition.

I tested this by substituting T with 5.

Option A: 5 + 8 = 13

Option B:  (1+\frac{8}{100}) = 1.08 --- 1.08 × 5 = 5.40

Option C: 1.08 × 5 = 5.40

Option D: 5 + 0.08 = 5.08

Hope this helpsss :)

4 0
3 years ago
Read 2 more answers
Does anyone know how to do this ? help
Oduvanchick [21]

The discriminant of ff is given by:

b^2-4ac=24^2-4 (multiply)3(multiply)48=576-576=0

2

−4ac=24

2

−4⋅3⋅48=576−576=0.

How many real number zeros does ff have?

Since the discriminant of ff is \green{0}0, ff has 11 distinct real number zero. Therefore, the graph of ff touches the xx-axis once. The graph of ff is shown below

Step-by-step explanation:


7 0
3 years ago
Find the surface area of the pyramid shown to the nearest whole number.
Snezhnost [94]

Answer:

<h3>The answer is option A</h3>

Step-by-step explanation:

Surface area of a pyramid =

area of base + area of triangular faces

Since it's a square based pyramid

It's surface area is

area of base + 4( area of one triangular face)

Since the square has equal sides

<u>For square base </u>

Area of a square = l²

where l is the length

From the question l = 5

So we have

Area of square base = 5² = 25ft²

<u>For one of the triangular face</u>

Area of a triangle = ½ × base × height

base = 5

height = 6

Area = ½ × 5 × 6 = 15ft²

So the surface area of the pyramid is

25 + 4(15)

= 25 + 60

We have the final answer as

<h3>Surface area = 85 ft²</h3>

Hope this helps you

7 0
3 years ago
Adnan states if cos30°≈0.866, then sin30°≈0.866.
kiruha [24]

Answer:

Adnan is incorrect because cosx and sin(90 - x) are always equivalent in any right triangle ⇒ first answer

Step-by-step explanation:

In any right triangle there are two acute angles sum of them is 90°

∴ If one of them x°, then the other is (90 - x)°

∵ cos x = adjacent/hypotenuse

∵ sin(90 - x) = opposite/hypotenuse

∵ The opposite of ∠(90 - x) is the adjacent of ∠x

∴ cosx = sin(90 - x)

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