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Ksivusya [100]
3 years ago
5

000_7th Math 2020-2021 Spring Benchmark

Mathematics
1 answer:
adelina 88 [10]3 years ago
7 0

Answer:

The distance between two cities is 70 km.

Step-by-step explanation:

Given that,

The distance between two cities on a map is 3.5 centimeters.

It is also mentioned that the map uses a scale  in which 1 centimeter represents 20 kilometers.

We need to find the actual distance  between these two cities in kilometers.

1 cm = 20 km

3.5 cm = (3.5 × 20) km

= 70 km

Hence, the distance between two cities is 70 km.

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John's free throw shooting percentage is 87%. If John shoots 12 free throws in the course of a game, what is the probability he
suter [353]

Answer:

0.2771

Step-by-step explanation:

This is a binomial probability question.  "Makes" is what some writers call a "success."  In the binomial probability distribution, the probability of  <em>r</em>  successes in  <em>n</em>  trials is

\binom{n}{r}p^r(1-p)^{n-r}

<em>p</em> is the probability of "success."  \binom{n}{r}=\frac{n!}{r!(n-r)!}

In this problem, <em>n</em> = 12,  <em>r</em> = 10, <em>p</em> = 0.87 (the 87%).

The probability of exactly 10 made shots out of 12 attempted is

\binom{12}{10}(0.87)^10(1-0.87)^2 =66(0.87^10)(0.13)^2 \approx 0.2771

4 0
3 years ago
This is urgent !!! please help asap !!!
Rudik [331]

Answer:

Δ QRS ≈ Δ QST ≈ Δ SRT ⇒ 3rd answer

Step-by-step explanation:

From the given figure

In Δ QRS

∵ m∠S = 90°

∵ m∠S = m∠QST + m∠RST

∴ m∠QST + m∠RST = 90° ⇒ (1)

- Use the fact the sum of the measures of the interior angles

   of a Δ is 180°

∴ m∠Q + m∠S + m∠R = 180°

∵ m∠S = 90

∴ m∠Q + 90° + m∠R = 180°

- Subtract 90 from both sides

∴ m∠Q + m∠R = 90° ⇒ (2)

In Δ QST

∵ m∠QTS = 90°

- By using the fact above

∴ m∠Q + m∠QST = 90 ⇒ (3)

- From (1) and (3)

∴ m∠QST + m∠RST = m∠Q + m∠QST

- Subtract m∠QST from both sides

∴ m∠RST = m∠Q

In Δ SRT

∵ m∠STR = 90°

- By using the fact above

∴ m∠R + m∠RST = 90 ⇒ (4)

- From (1) and (4)

∴ m∠QST + m∠RST = m∠R + m∠RST

- Subtract m∠RST from both sides

∴ m∠QST = m∠R

In Δs QRS and QST

∵ m∠S = m∠QTS ⇒ right angles

∵ m∠R = m∠QST ⇒ proved

∵ ∠Q is a common angle in the two Δs

∴ Δ QRS ≈ Δ QST ⇒ AAA postulate of similarity

In Δs QRS and SRT

∵ m∠S = m∠STR ⇒ right angles

∵ m∠Q = m∠RST ⇒ proved

∵ ∠R is a common angle in the two Δs

∴ Δ QRS ≈ Δ SRT ⇒ AAA postulate of similarity

If two triangles are similar to one triangle, then the 3 triangles are similar

∵ Δ QRS ≈ Δ QST

∵ Δ QRS ≈ Δ SRT

∴ Δ QRS ≈ Δ QST ≈ Δ SRT

7 0
3 years ago
Emily puts $100 in the bank and earns 4% interest per year.
grin007 [14]

Answer:

$4

Step-by-step explanation:

100 x 0.04 but to make it easier you do

1 x 4 which is 4

7 0
3 years ago
Read 2 more answers
Help please :). I need helppppppo
Nady [450]

Answer:

386% is the 1 3/4 and the other is 239% I think?

Step-by-step explanation:    

5 0
3 years ago
2√3+4√18 in simplest radical form
Sedaia [141]

Answer:

2\sqrt{3} + 12\sqrt{2}

Step-by-step explanation:

Simplify each term.

4 0
3 years ago
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