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3 years ago

Could someone help me with this?

Mathematics

1 answer:

Juli2301 [7.4K]3 years ago

4 0

(4,4)736472i would help but i jus points to do my homework lol

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Please help!

Gemiola [76]

The derivative of $f(x) = 2\cdot x^{2}-9$ is $f'(x) = 4\cdot x$ .

In this exercise we must apply the definition of derivative, which is described below:

$f'(x) = \lim_{x \to 0} a_n \frac{f(x+h)-f(x)}{h}$ (1)

If we know that $f(x) = 2\cdot x^{2}-9$ , then the derivative of the expression is:

$f'(x) = \lim_{h \to 0} \frac{2\cdot (x+h)^{2}-9-2\cdot x^{2}+9}{h}$

$f'(x) = 2\cdot \lim_{h \to 0} \frac{x^{2}+2\cdot h\cdot x + h^{2}-2\cdot x^{2}}{h}$

$f'(x) = 2\cdot \lim_{h \to 0} 2\cdot x + h$

$f'(x) = 4\cdot x$

The derivative of $f(x) = 2\cdot x^{2}-9$ is $f'(x) = 4\cdot x$ .

We kindly invite to check this question on derivatives: brainly.com/question/23847661

4 0

3 years ago

1. two positive numbers are in

SIZIF [17.4K]

Answer:

Step-by-step explanation:

the ratio of the 2 numbers = 3 : 4 = 3x : 4x ( x is a multiplier ) , then

3(3x) + 2(4x) = 68 , that is

9x + 8x = 68

17x = 68 ( divide both sides by 17 )

x = 4

smaller number = 3x = 3 × 4 = 12

7 0

3 years ago

Approximately how many square inches of fabric were used to make the triangular flag? 15 square inches 76 square inches 186 squa

Law Incorporation [45]

The area used to make the triangular flag is 15 square inches.

Given

Two of the sides are 8 in.

Lila made a triangular flag to cheer on her favorite sports team.

The perimeter of the flag is 20 inches.

<h3>What is Heron’s formula?</h3>

Semi-perimeter is equal to the sum of all three sides of the triangle divided by 2.

Then,

The value of S is;

$\rm S = \dfrac{20}{2}\\\\S =10$

Therefore,

The area used to make the triangular flag is;

$\rm Area = \sqrt{s(s-a)(s-b)(s-c)} \\\\A rea= \sqrt { (10)(10-8)(10-8)(10-4) }\\\\Area = \sqrt{10 \times 2 \times 2\times 6}\\\\Area = \sqrt{240}\\\\Area = 15.49$

Hence, the area used to make the triangular flag is 15 square inches.

To know more about Heron's formula click the link given below.

brainly.com/question/13907146

8 0

2 years ago

8 2/10- 5 7/10 I really need to know the answer to this

Darina [25.2K]

Answer:

$\frac{5}{2}$

Step-by-step explanation:

$8\frac{2}{10}$ - $5\frac{7}{10}$ = $\frac{5}{2}$

6 0

3 years ago

Write the 2-digit number that matches the club

Temka [501]

Answer:

Step-by-step explanation:

for a 2-digit number the tens digit (x) is 8 more than the ones digit (y) and no number is zero

=> x = y+8

x < 10

y > 0

y = 1 and x = 1 + 8 =9

the 2-digit is 91

5 0

3 years ago