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3 years ago

13

What type of expression is 3x+7

2 answers:

sashaice [31]3 years ago

8 0

I think it's a one step equation

larisa86 [58]3 years ago

4 0

<h2>Answer</h2>

This question is related to basic algebraic expression. Its answer will be -7/3

<h2>Explanation</h2>

Any mathematical phrase that contains numbers, variables with algebraic operators (like +, -, *, /) is called algebraic expression equation. The values of variables such as x, y or a, b can be changed accordingly. In this phrase, 3 and 7 are constant numbers while x represents a variable. Some other examples of an algebraic expression are the following;

x + 6

y + z -1

To solve this problem,

3x +7 =0

3x = -7

x = -7/3

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vagabundo [1.1K]

Answer:

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Step-by-step explanation:

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3 years ago

Factorise the following expressions.<br> a) 6x + 5x + 1<br> b) 6x2 13x + 6

fredd [130]

Answer:

a) 1 1 + 1

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Step-by-step explanation:

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2 years ago

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3 years ago

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The area of the square is 100 square centimeters. What is the area of the circle?

swat32

Answer:

Since the question is incomplete, see the figure attached and the explanation below.

Explanation:

Since the figure is missing, I enclose the figure of a square inscribed in a circle.

Since the <em>area of a square</em> is the side length squared, you can determine the side length:

Area = (side length)²

100 cm² = (side lenght)²

$side\text{ }length=\sqrt{100cm^2}=10cm$

From the side length, you can find the diagonal of the square, which is equal to the diameter of the circle, using the Pythagorean theorem:

diagonal² = (10cm)² + (10cm)² = 2 × (10cm)²

$diagonal=\sqrt{2\times (10cm)^2}\\ \\ diagonal=10\sqrt{2} cm$

The area of the circle is π (radius)².

radius = diameter/2 = diagonal/2

$area= \pi \times (5\sqrt{2}cm)^2=50\pi cm^2$

6 0

3 years ago

The fraction of defective integrated circuits produced in a photolithography process is being studied. A random sample of 300 ci

4vir4ik [10]

Answer:

(a) The confidence interval is: 0.0304 ≤ π ≤ 0.0830.

(b) Upper confidence bound = 0.0787

Step-by-step explanation:

(a) The confidence interval for p (proportion) can be calculated as

$p \pm z*\sigma_{p}$

$\sigma=\sqrt{\frac{\pi*(1-\pi)}{N} }\approx\sqrt{\frac{p(1-p)}{N} }$

NOTE: π is the proportion ot the population, but it is unknown. It can be estimated as p.

$p=17/300=0.0567\\\\\sigma=\sqrt{\frac{p(1-p)}{N} }=\sqrt{\frac{0.0567(1-0.0567)}{300} }=0.0134$

For a 95% two-sided confidence interval, z=±1.96, so

$\\LL = p-z*\sigma=0.0567 - (1.96)(0.0134) = 0.0304\\UL =p+z*\sigma= 0.0567 + (1.96)(0.0134) = 0.0830\\\\$

The confidence interval is: 0.0304 ≤ π ≤ 0.0830.

(b) The confidence interval now has only an upper limit, so z is now 1.64.

$UL =p+z*\sigma= 0.0567 + (1.64)(0.0134) = 0.0787$

The confidence interval is: -∞ ≤ π ≤ 0.0787.

5 0

3 years ago