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4 years ago

Help me I really need help answer asappppppppp

Mathematics

2 answers:

labwork [276]4 years ago

5 0

Answer:

$4.76

Step-by-step explanation:

The cost is $15.24

She gave $20.00

Therefore, you subtract to find the change she would receive.

20-15.24=4.76

This means that she should get $4.76 in change

Hope this was helpful

Mandarinka [93]4 years ago

3 0

Answer:

C. 4.76

Step-by-step explanation:

20 - 15.24 =

20 - 15 and then you still need to subtract 0.24

20 - 15 = 5

5 - 0.24 just for fun... if it was minus 0.25 then you would know the answer by heart, right, but in that case, you would have subtracted 0.01 too much. So if you add that 0.01 you can do it all by heart,

5 - 0.24 = ( 5 - 0.25 ) + 0.01

( 4.75 ) + 0.01

4.76

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Svet_ta [14]

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3 years ago

You toss a fair coin 4 times. What is the probability that:

Masteriza [31]

Answer:

a. 1/16 which is 6.2500%

b. 15/16 which is 93.7500%

Step-by-step explanation:

a. For each 'coin toss' the probability of getting tails is 1/2. If you toss the coin 4 times, the probability of getting tails all times is 1/2 * 1/2 * 1/2 * 1/2 = 1/16.

b. This one is a bit trickier.

When flipping four coins, you either could get all four heads or you could get at least one tail. Both events cannot happen at the same time. This means the two events are complementary.

Complementary events occur when there are only two outcomes, for example passing an exam or passing an exam. The complement means the exact opposite of an event.

Complementary probabilities always add to 1.

We saw in part (a) that the probability you get all tails is 6.25% or 1/16.

0.0625 was the probability of getting all four heads, so 0.9375 is the probability of anything else (getting one or more tails).

The decimal 0.9375 converts to the fraction 15/16.

The probability is 93.75%.

6 0

3 years ago

PLEASE HELP!!

Marysya12 [62]

The first system of equations has infinite solutions because you can write one equation as a linear combination of the other.The second system of equations has no solution because mathematically an incoherence results -14 = -2 / 7I attach the solutions for greater understanding.
x-4y=12; 5x-20y=60 --> infinitely many
y-7x=-14; 7y-49x=-2 --> none

3 0

3 years ago

Cora has a pink ribbon and a teal ribbon. The pink ribbon is 4 1/12 inches long. The teal ribbon is 8 5/12 inches longer than th

alexgriva [62]

Answer:

12 1/2

Step-by-step explanation:

3 0

3 years ago

A TEACHER IS CONSTRUCTING A MATHEMATICS TEST

Nuetrik [128]

The number of ways of constructing questions from the pool of 28 questions if her test is to have 3 difficult, 4 average and 3 easy questions is 924, 000 ways

<h3>How to determine the combination</h3>

Note that the formula for combination is given as;

Combination = $\frac{n!}{r!(n-r)!}$

From the information we have that;

There are 28 questions in the pool

The test should have a total of 10 questions;

6 difficult , 10 average and 12 easy questions

We are asked to determine the combination of;

3 difficult questions

4 average questions

3 easy questions

6C3 = $\frac{6!}{3!(6-3)!}$

6C3 = $\frac{720}{36}$

6C3 = 20

10C4 = $\frac{10!}{4!(10-4)!}$

10C4 = $\frac{3628800}{17280}$

10C4 = 210

12C4 = $\frac{12!}{4!(12-4)!}$

12C4 = 220

The number of ways of constructing the questions is

= 20 × 210 × 220

= 924, 000 ways

Thus, the number of ways of constructing questions from the pool of 28 questions if her test is to have 3 difficult, 4 average and 3 easy questions is 924, 000 ways

Learn more about combination here:

brainly.com/question/4658834

#SPJ1

7 0

2 years ago