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lilavasa [31]
3 years ago
8

the access code for a car's security system consists of four digits. the first digit cannot be 1 and the last digit must be even

or zero. how many different codes are available?
Mathematics
1 answer:
Stells [14]3 years ago
5 0
For the 1st digit we can use 9 of them ( it cannot be 1 ). For the 2nd and the 3rd we can use 10 and for last one we can use 5 digits ( 0, 2 , 4 , 6 and 8 ).
9 · 10 · 10 · 5 = 4,500
Answer: 4.500 different codes.
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Five children have to form a queue. In how many different ways can they be arranged?
Paladinen [302]

Answer:

120 different ways

The total number of ways to do this is the product because of the fundamental counting principle[1]. So 5x4x3x2x1 = 5! (read as “5 factorial”[2]) = 120 different ways to line up those 5 people. Five people lining up essentially means 5 people sorting into 5 positions.

8 0
3 years ago
reflection symmetry is the quality a design has if it maintains all characteristics when it is rotated about an axis lying in it
OlgaM077 [116]

Answer:

True if reflection over a line.

Step-by-step explanation:

Given that there is a reflection symmetry. We have to discuss about the quality of the design.

By reflection , we mean it can be either on a line or on a point.

If symmetry is on a line, then we get a mirror image of the original one keeping the line of symmetry as mirror.  Hence in this case when rotated about axis of symmetry lying it its plane the original design would be maintained.

Examples are : Circles, ellipses, hyperbolas, etc.

Reflection about a point is obtained by keeping equal distance form the point.

For example, reflection of (1,1) over origin would be (-1,-1)

Here the rotation quality may not apply

8 0
3 years ago
Read 2 more answers
Please help! No links! Thanks!!
Readme [11.4K]

Answer: 30

Step-by-step explanation:

3 times 2 is 6 and divided by 2 is 3 and 3 times 10 is 30

5 0
3 years ago
Help me please —————
Kay [80]

Answer:

n=2

Step-by-step explanation:

4 0
3 years ago
Name one advantage of the metric system over the customary system.
ad-work [718]
Here are some examples.

1. see attachment
metric is all base 10.
1m=100cm=1000mm
measurements like kg and g and mg are sized by prefexes that are powers of 10

in imperial, we've got 12in=1ft and 3ft=1yard and other rediculous stuff like that

a comparison from tumblr is below

"to remember how many feet there are in a mile, u just gotta use 5 tomatoes

five to-mate-oes sounds like five, two, eight, 0 and there’s 5280 feet in a mile

To remember how many meters there are in a kilometre you just remember “1000” because the system of measurement in the rest of the world wasn’t invented by a drunk mathematician rolling dice."

2. metric has a separate measurement for Mass and force (kg and Newton) while English has. lbs being used for both (technically mass is slugs and force is lbs but who uses slugs to find mass?

I conclude with this exerpt from Josh Bazell's Wild Thing
“In metric, one milliliter of water occupies one cubic centimeter, weighs one gram, and requires one calorie of energy to heat up by one degree centigrade—which is 1 percent of the difference between its freezing point and its boiling point. An amount of hydrogen weighing the same amount has exactly one mole of atoms in it. Whereas in the American system, the answer to ‘How much energy does it take to boil a room-temperature gallon of water?’ is ‘***********,’ because you can’t directly relate any of those quantities.” 

5 0
4 years ago
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