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DENIUS [597]
3 years ago
6

La un concurs de matematica se dau spre rezolvare 6 probleme si pentru fiecare problema rezolvata corect si complet se acorda 7

puncte,pentru fiecare problema gresita sau rezolvata incomplet se scade 10 puncte,iar pentru fiecare problema neacordata se scade un punct.andrei a obtinut la concurs 17 puncte.Cate probleme a rezolvat corect?
Mathematics
1 answer:
siniylev [52]3 years ago
5 0

puteți explica problema mai mult, întrebarea dvs. este confuză, și mi-ar plăcea să vă ajute? :)

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An 80-foot rope from the top of a tree house to the ground forms a 45° angle of elevation from the ground. How high is the top o
lina2011 [118]

Answer:

56.6m

Step-by-step explanation:

Using SOH = opp/hyp

Where θ = 45°

Hpy = 80m

Opp = ?

Sin θ = opp/hpy

Sin 45 = opp/ 80

Sin 45 × 80 = opp

0.7071 × 80 = opp

Opp = 56.568

~ 56.6m

Hence the height of the top of the tree is 56.6m

4 0
3 years ago
ms. Omar runs the school tennis club. She has a bin of tennis balls and rackets. For every 5 tennis balls in the bin, there are
anygoal [31]

Answer:

see the explanation

Step-by-step explanation:

Let

x ----> number of tennis balls

y ----> number of tennis rackets

we know that

To find out the ratio of tennis balls to tennis rackets, divide the number of tennis ball by the number of tennis rackets

In this problem we have

\frac{x}{y}=\frac{5}{3}

see the model in the attached figure N 1

so

y=\frac{3}{5}x

y=0.60x

This is the equation of a linear direct variation

The relationship between the variables x and y is proportional

see the model in the attached figure N 2

4 0
3 years ago
Find the expressions that have a quotient of 7 R12. choose all that apply
maksim [4K]

Answer:

Try D. I am not exactly sure but let's hope it works.

Step-by-step explanation:

8 0
4 years ago
Read 2 more answers
A box contains 14 large marbles and 10 small marbles. Each marble is either green or white 8 of the large marbles are green, and
netineya [11]

The probability that the marble is large or white is 0.5714.

<h3>What is probability?</h3>

Probability is the branch of mathematics that studies the possible outcomes of given events together with the outcomes' relative likelihoods and distributions.

Probability of an event is

P(A) = Number of favorable outcomes/ Total Number of outcomes      

       = n(A)/n(S)

where

P(A) is the probability of an event “A”

n(A) is the number of favorable outcomes

n(S) is the total number of events in the sample space.

We have,

Number of large marbles = 14

Number of small marbles = 10

Number of large green marbles = 8 which implies

Number of large white marbles = 14 - 8 = 6

Number of small white marbles = 4 which implies

Number of small green marbles = 10 - 4 = 6.

Now, let

Let X be the event of drawing large marble.

Let Y be the event of drawing small marble.

Let M be the event of drawing white marbles.

Let N be the event of drawing green marbles.

Since only one marble is drawn at a time ,

so P(X) =  14/24

    P(Y) = 10/24

    P(M) = 10/24

    P(N) = 14/24

We have to find the probability that a marble is large or white i.e. P(X∪M).

P(X∪M) = P(X) + P(Y) - P(X∩M)

P(X∩M) = In 14 large marbles 6 are white marbles = 6/14.

P(X∪M) = P(X) + P(Y) - P(X∩M) = 14/24 + 10/24 - 6/14 = 0.5833+0.4167-0.4286 = 0.5714.

Therefore, the probability of drawing large or white marble is 0.5714.

To know more about probability, visit

brainly.com/question/19169117

#SPJ4

3 0
1 year ago
The Vertex of a parabola is at (8-1), and it's why intercept is negative 17, which function represents the parabola
suter [353]

Answer:

The function is equal to y=-(1/4)(x-8)^{2}-1

Step-by-step explanation:

we know that

The equation of a vertical parabola in vertex form is equal to

y=a(x-h)^{2}+k

where

a is a coefficient

(h,k) is the vertex

In this problem we have

(h,k)=(8,-1)

substitute

y=a(x-8)^{2}-1

<u><em>Find the value of a</em></u>

Remember that we have the y-intercept

The y-intercept is the point (0,-17)

substitute

x=0,y=-17

-17=a(0-8)^{2}-1

-17=64a-1

64a=-17+1

64a=-16

a=-16/64

a=-1/4

therefore

The function is equal to

y=-(1/4)(x-8)^{2}-1

see the attached figure to better understand the problem

4 0
4 years ago
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