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3 years ago

mark wants to buy a skateboard that costs $65. he plans to save $5 per week. how many weeks will it take him to save $65

Mathematics

1 answer:

irina1246 [14]3 years ago

5 0

Answer:

13 weeks

Step-by-step explanation:

65=5w

w=65/5

w=13

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2. A bag contains 5 red marbles, 3 blue marbles, 6 white marbles, and 2 green marbles.

Georgia [21]

Answer:

Step-by-step explanation:

5 red

3 blue

6 white

2 green

total 16 marbles.

Note: P(E) = probability of event E happening

P(~E) = probability of event E NOT happening.

We usually leave probabilities in fractions whenever possible because they will not be subject to round-off errors.

A. choose one marble at random.

P(W) = 6 white / 16 total = 3/8

B. choose one marble at random.

P(~R) = (16-5)/16 = 11/16

C. choose one marble at random, then a second one without replacement,

there will be 3 blue out of 16 at the beginning, then if successful, there will be 2 blue out of 15.

P(BB) = (3/16)*(2/15) = 1 / 40

D. choose two with replacement

5 red out of 16 for first draw, still 5 red out of 16 for second draw.

P(RR) = (5/16)^2 = 25/256

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3 years ago

Angle problem -math

Jet001 [13]

Its D because vertical angles are right across from each other!

6 0

3 years ago

How do I show variance in an equation for example if lets say the margin of error is .3 how do I express that in an expression?

Vera_Pavlovna [14]

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4 years ago

The diameter of your bicycle wheel is 25 inches. How far will you move in two turns of your wheel? Use 3.14 for pi. A.40in. B.75

Kisachek [45]

Answer is: 150 inches

Explanation:

d==> 25 inches

π==>3

solution ==>

circumference ==> π*d

==>3*25 inches

==>75 inches

it will cover 75 cm in 1 turn.

so, in two turns, it will cover ==>2*75 inches

==>150 inches

hence, correct answer is 150 inches.

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4 years ago

1. Of the light bulbs available at a store, 42% are fluorescent, 23% are labeled as long life, and 12% are fluorescent and long

Novosadov [1.4K]

Answer:

Step-by-step explanation:

Given

42% bulbs are fluorescent

23 % bulbs are long life

12% bulbs are fluorescent and long life

(i)Selected Bulb is not Fluorescent $=1-P(bulb\ i\ fluorescent)$

$=1-0.42=0.58$

(ii)Selected light bulb is fluorescent given that it is labelled as long life

$P(Fluorescent\ given\ it\ long\ life)=\frac{P(fluorescent\ and\ long\ life)}{P(long\ life)}$

$P(Fluorescent\ given\ it\ long\ life)=\frac{0.12}{0.23}=0.52$

b.Fluorescent and long life events are not independent because if a bulb is fluorescent then it may be long life

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4 years ago