2 years ago

HOW MANY 7 DIGIT TELEPHONE NUMBERS ARE POSSIBLE IF THE FIRST DIGIT CANNOT

Mathematics

1 answer:

lyudmila [28]2 years ago

6 0

Answer:

there are 8 million different phone numbers whose phone numbers whose digits aren't 0 or 1

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What is the height of an equilateral triangle if the sides are 10

4vir4ik [10]

Answer:

The height of the equilateral triangle is $5\sqrt{3}\ units$

Step-by-step explanation:

we know that

An equilateral triangle has three congruent sides, and three congruent angles that each measure 60 degrees

To find out the height of an equilateral triangle, apply the Pythagoras Theorem in the right triangle ABD

Remember that the height of an equilateral triangle bisects the base.

see the attached figure to better understand the problem

$AB^2=AD^2+BD^2$

substitute the given values

$10^2=5^2+BD^2$

Solve for BD

$100=25+BD^2$

$BD^2=100-25$

$BD^2=75$

$BD=\sqrt{75}\ units$

simplify

$BD=5\sqrt{3}\ units$ `

therefore

The height of the equilateral triangle is $5\sqrt{3}\ units$

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3 years ago

Find the missing factors 3x^3+12x^2-9x=3x

Flura [38]

$9x + 144x - 9x = 3x$
that's what you do first

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3 years ago

How do you write f(x)=-5x^2-100x+8 in vertex form?

goblinko [34]

Vertex form is:
f(x) = -5(x+10)^2 + 508

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2 years ago

From least to greatest A=4.6*10^-4 B=2.4*10^-3 C=3.5*10^5 D=6.3*10^-4?

balandron [24]

A D B C The lowest power is the lowest number. If the powers are the same, the initial number dictates wether it is smaller or larger.

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2 years ago

HELP ME PLEASE THIS IS DUE IN AN HOUR PRE-ALGEBRA WHOEVER HELPS THX <3

grin007 [14]

Answer:

it's is letter d cuz 5-4 and 5-3 is 5-5

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2 years ago

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