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3 years ago

Using 7 four times and 1 one time getting to 100

Mathematics

1 answer:

777dan777 [17]3 years ago

4 0

Answer:

So the answer is $(7+\frac{1}{7} )\times (7+7)=100$

Step-by-step explanation:

Given,

Using $7$ four times and $1$ one time getting to $100$

If we are write this way then easily get the answer;

$(7+\frac{1}{7} )\times (7+7)$

Add together $7+\frac{1}{7}$ by making a common denominator of $7$ and also add $(7+7)$ in the second set of parenthesis to yield $14$

$(\frac{49+1}{7} )\times 14$

$\frac{50}{7} \times 14$

$50\times 2$ (By Cross-reduce and multiply the fractions)

$100$

∴ $(7+\frac{1}{7} )\times (7+7)=100$

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MAXImum [283]

Answer:

3900 x.094 = 366.60

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2 years ago

A baseball player has a batting average of 0.25. What is the probability that he has exactly 2 hits in his next 7 at bats

marissa [1.9K]

Answer:

The probability that he has exactly 2 hits in his next 7 at-bats is 0.3115.

Step-by-step explanation:

We are given that a baseball player has a batting average of 0.25 and we have to find the probability that he has exactly 2 hits in his next 7 at-bats.

Let X = Number of hits made by a baseball player

The above situation can be represented through binomial distribution;

$P(X = r) = \binom{n}{r}\times p^{r} \times (1-p)^{n-r}; x = 0,1,2,......$

where, n = number of trials (samples) taken = 7 at-bats

r = number of success = exactly 2 hits

p = probability of success which in our question is batting average

of a baseball player, i.e; p = 0.25

SO, X ~ Binom(n = 7, p = 0.25)

Now, the probability that he has exactly 2 hits in his next 7 at-bats is given by = P(X = 2)

P(X = 2) = $\binom{7}{2}\times 0.25^{2} \times (1-0.25)^{7-2}$

= $21 \times 0.25^{2} \times 0.75^{5}$

= 0.3115

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3 years ago

Given a right triangle with legs a, b and hypotenuse c, solve for b if a= 72 and c= 75

kotykmax [81]

Answer:

The answer is a. 21.

Step-by-step explanation:

We solve this question by using Pythagoras theorem to relate the sides of a right angled triangle.

Here,

Hypotenuse of the given triangle(c)=75

Two sides of right angled triangle are:

a=72

b=?

Then,

for a given right angled triangle abc,

Using Pythagoras theorem,

$c=\sqrt{a^{2} +b^{2} }$

Squaring on both sides,

$c^{2} =a^{2}+b^{2}$

or, $75^{2}=72^{2}+b^{2}$

or, $b^{2}=75^{2}-72^{2}$

or, $b^{2}=5625- 5184$

or, $b^{2} =441$

∴ $b=21$

So, the value of b is obtained to 21 by the use of Pythagoras theorem.

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3 years ago

I need some help with my homework so may someone help me not in a rush just need this done

Paladinen [302]

Answer:

-25

Step-by-step explanation:

First he bought 3 tires which total costed 105, then returned 2, so he got $70 back, meaning he had $35. Then he found 2 $20 bills, which raised his total to $75. Then, he bought a phone for $90, so he has -25 dollars left

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2 years ago

A tree broke 6 feet from the bottom. If the top landed 12 feet from the base, how tall was the tree before it broke?

spayn [35]

Answer:

7.4 ft

Step-by-step explanation:

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2 years ago

Using 7 four times and 1 one time getting to 100​

Using 7 four times and 1 one time getting to 100