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Alika [10]
3 years ago
12

What are the mental math steps to find 7(42)

Mathematics
1 answer:
Kaylis [27]3 years ago
8 0
7*40 = 280, 7*2 = 14,
 add both and  get 280+14 = 294
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Aflati triunghiul dreptunghic ABC daca a) a=17 si b=8<br> b) c=6<br> C=42 grade
Ierofanga [76]
Answer is c c=42 grade
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4 years ago
The area of the regular octagon is approximately 54 cm2. What is the length of line segment AB, rounded to the nearest tenth?
erastova [34]

Answer:

AB = 3.3 cm

Step-by-step explanation:

The formula to find out area of a regular octagon is given by

A=2(1+\sqrt{2})a^{2}

where a is the length of each side of the regular octagon.

Plugin A=54 into the formula

54=2(1+\sqrt{2})a^{2}

Divide both sides by 2

\frac{54}{2} =\frac{2}{2} (1+\sqrt{2})a^{2}

27 = (1+\sqrt{2})a^{2}

Plugin √2 as 1.41

27 = (1+1.41)a^{2}

27 = (2.41)a^{2}

Divide both sides by 2.41

\frac{27}{2.41} = \frac{2.41}{2.41} a^{2}

11.20 = a^{2}

Taking square root on both sides

\sqrt{11.20}  = \sqrt{a^{2}}

a = 3.346

a = 3.3 cm (rounded to nearest tenth)

so, length of side AB = 3.3 cm

6 0
3 years ago
Read 2 more answers
X-2y/12y^2-x+4y/12y^2 simplify
Anon25 [30]
(2x+2y)/(12y^2) would be the simplist

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4 years ago
Find the domain over which the function y = x + 6x is monotonic increasing.
iragen [17]

Answer:

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\sf (-3, \infty)

Step-by-step explanation:

Domain: input values (x-values)

Monotonic increasing:  always increasing.  
A function is increasing when its graph rises from left to right.

The graph of a quadratic function is a parabola.  If the leading term is positive, the parabola opens upwards.  The domain over which the function is increasing for a parabola that opens upwards is values greater than the x-value of the vertex.

<u>Vertex</u>

Standard form of quadratic equation:  \sf y=ax^2+bx+c

\textsf{x-value of vertex}=\sf -\dfrac{b}{2a}

Given function:

\sf y=x^2+6x

Therefore, x-value of function's vertex:

\sf \implies x= -\dfrac{6}{2}=-3

<u>Final Solution</u>

The function is increasing when x > -3

\sf (-3, \infty)

4 0
3 years ago
The sets of numbers 3, 4, 5, and 8, 15, 17 are Pythagorean triples. Use what you know about the Pythagorean Theorem and explain
Leviafan [203]

Answer:

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Take the largest number of each as C (hypotenuse)

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(3)^2+(4)^2= (5)^2

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Therefore it is a Pythagorean Triple.

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(8)^2+(15)^2=(17)^2

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Therefore it is a Pythagorean Triple.

7 0
4 years ago
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