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2 years ago

Help me with this pls

Mathematics

2 answers:

oksano4ka [1.4K]2 years ago

4 0

Answer:

x=9

Step-by-step explanation:

dyyfjfjsjujsjsivjsjicuejie82iu3828i$>÷>$>$>×&$:

ollegr [7]2 years ago

4 0

Answer:

x = 9

Step-by-step explanation:

Cross multiply:

2x = 18

x = 18/2

x = 9

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A class’s test scores are normally distributed if the average score 60 and the standard deviation is 7 choose the spots where th

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Answer:

Step-by-step explanation:

We are given that a class's test scores are normally distributed with an average score of 60.

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60-14=46

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2 years ago

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Answer:

y = 10

Step-by-step explanation:

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2 years ago

5. Class 7887 has 2:7 math classes daily. How many math classes do they have

ANTONII [103]

Answer:

56.7

Step-by-step explanation:

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2 years ago

A parallelogram has an area of 300 square kilometers and a height of 20 kilometers. What is the length of the base?

Neko [114]

Answer: the length of the base is 15 kilometers.

Step-by-step explanation:

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2 years ago

Crawling Crayfish!

boyakko [2]

Answer: Crayfish, 25 s

Step-by-step explanation:

Given

The length of race is 60 cm

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Cray fish covers 6 cm in 5 s i.e. its speed is

$\Rightarrow \dfrac{6}{5}=1.2\ cm/s$

Flicker covers 4 cm in 5 s, its speed is

$\Rightarrow \dfrac{4}{5}=0.8\ cm/s$

Time taken by Cray fish to cover the race is

$\Rightarrow t_1=\dfrac{60}{1.2}\\\\\Rightarrow t_1=50\ s$

Time taken by flicker to cover race with 10 cm head start

$\Rightarrow t_2=\dfrac{60-10}{0.8}\\\\\Rightarrow t_2=62.5\ s$

Time taken by crayfish is less. Hence, crayfish wins the race

When they both covers the same distance, they tied momentarily i.e.

$\Rightarrow 1.2t=10+0.8t\\\Rightarrow 0.4t=10\\\\\Rightarrow t=\dfrac{10}{0.4}\\\\\Rightarrow t=25\ s$

After 25 s, they tied the race.

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2 years ago