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Anestetic [448]
3 years ago
5

Hi I need help I'm clueless and it's due Tomorrow!!!!

Mathematics
1 answer:
gtnhenbr [62]3 years ago
7 0
To multiply fractions, multiply the numerators and denominators and reduce if possible. For problem 3, do 7 x 4 = 28. This is the numerator of the answer. The denominator is 8x5 = 40. Therefore, your unreduced fraction is 28/40. Since both 28 and 40 are multiples of 4, you can reduce it to 7/10, since 28/4=7 and 40/4=10.
Use this same process for problems 4 through 12.

For problem 13: 2/5= 4/10, so the black box = 1/2. This is because you multiply the numerators and the denominators.
Numerators: 4 x 1 = 4. Denominators: 5 x 2 = 10
So, your result fraction is 4/10, which reduces to 2/5.
Therefore, the answer is 1/2 ( above math was explanation)

14: multiply the two fractions
6/7 x 4/5 = 24/35, so the answer is 24.

15. Count the shaded squares. There are 25 shaded squares out of 40. The fraction is therefore 25/40 = 5/8.
Now count the dotted squares. There are 24 shaded squares out of 40. The fraction is 24/40= 3/5.
You could also just look at the far right row to get the same answer because it will reduce anyway, but that might confuse you more.

The answer to 15 is multiplying the two fractions, 5/8 x 3/5.

16. Since both fractions reduce to 1 (numerators are the same as denominators), the model would be 3 boxes by 4 boxes, all shaded and all with dots in the middle.
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Please answer. Thank you.
Aloiza [94]

Answer:

G.

Step-by-step explanation:

Graph shows constant change between the weight and the cost.

3/2.25 is 1.33333333

4/3 is 1.3333333

5/3.75 is 1.3333333 as well.

Others are not constant.

8 0
2 years ago
Which values are possible rational roots of 4x3+9x2−x+10=0 according to the rational root theorem? Select each correct answer. ±
chubhunter [2.5K]

Answer:

±2

Step-by-step explanation:

For simplicity let's take a look at a general third order polynomial:

ax^3 + bx^2 + cx + d.  In this particular case,

rational roots have the form ±d/±a.  Note that these are fractions/ratios.  Beyond that, we factor d and choose numerators ±(all possible whole number factors of d, dividing these results by all possible factors of a.

Looking at 4x^3 + 9x^2 - x + 10 = 0, we see that d = 10 and that factors of d include ±1, ±2, ±5 and ±10.  a = 4 and factors of a include ±1, ±2, ±4.

So, any rational roots of the given polynomial will stem from the possible rational roots

±1    ±2    ±5    ±10    ±1    ±2    ±5    ±10

--- , ----- , -----, ------- , ---- , ----- , --- , ------ , and so on,

±1    ±1     ±1      ±1      ±2    ±2   ±2     ±2

until you have used up all of the possible factors of 10 and all of the possible factors of 4.  

Of the four possible rational roots you have shared, only ±2 (which would actually be ±2 / ±1) is acceptable.

4 0
3 years ago
Read 2 more answers
Dill and Bromberg, Problem 1.23. The San Francisco football team plays better in fair weather. They have a 70% chance of winning
shtirl [24]

Answer:

a) 40% probability that San Francisco will win.

b) 80% probability that the weather was bad

Step-by-step explanation:

We have these following probabilities:

60% chance of snow(bad weather).

If there is bad weather, 20% probability of SF winning.

100-60 = 40% chance of good weather.

If there is good weather, 70% probability of SF winning.

(a) If they play in the Super Bowl in Wisconsin and the weatherman predicts a 60% chance of snow that day, what is the probability that San Francisco will win.

20% of 60%, plus 70% of 40%. So

0.2*0.6 + 0.7*0.4 = 0.4

40% probability that San Francisco will win.

(b) Given that San Francisco lost, what is the probability that the weather was bad?

We use the conditional probability formula to solve this question.

Conditional probability:

We use the conditional probability formula to solve this question. It is

P(B|A) = \frac{P(A \cap B)}{P(A)}

In which

P(B|A) is the probability of event B happening, given that A happened.

P(A \cap B) is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: SF losing

Event B: Bad weather

P(A)

From a), 40% probability that SF wins. So 100-40 = 60% = 0.6 probability that SF losses.

So P(A) = 0.6

P(A and B)

60% chance of snow. If it snows, 80% probability of SF losing. So

P(A \cap B) = 0.6*0.8 = 0.48

P(B|A) = \frac{0.48}{0.60} = 0.8

80% probability that the weather was bad

6 0
3 years ago
Simplify the following expression. (K + 8)(3k^2 - 5k + 7)
natka813 [3]

Answer:

<h3><em>3k^3+19k^2-33k+56</em></h3>

Step-by-step explanation:

3k^3-5k^2+7k+24k^2-40k+56

3k^3+19k^2-33k+56

3 0
2 years ago
If 21x = 63y, what is the ratio of x to y expressed in simplest form? Please show work.
ELEN [110]
 I believe these would be your steps:
21x = 63y

divide by a common factor of 7

3x = 9y

divide by a common factor of three

x = 3y is your simplest ratio 

Hope this helps!
8 0
3 years ago
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