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1 year ago

Which expression is equivalent to 2 3/5 divided by 7/9?

Mathematics

1 answer:

stealth61 [152]1 year ago

6 0

Step-by-step explanation:

$2 \frac{3}{5} \div \frac{7}{9 } \\ \frac{13}{5} \times \frac{9}{7} \\ = \frac{117}{35}$

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On the highway, a car can travel 21 miles per gallon of gas. If the car travels for 4 hours on the highway at a rate of 65 miles

lora16 [44]

Answer:

12.4 gallons

Step-by-step explanation:

65 mph x 4 hours means the car went 260 miles. Divide by 21 to get the number of gallons. 12.4 gallons.

6 0

1 year ago

Read 2 more answers

The variable z is directly proportional to x, and inversely proportional to y. When x is 11 and y is 14, z has the value 7.85714

marta [7]

Z=kx/y

7.9=k11/14

Cross multiply

K11=7.9x14

K =7.9x14/11

K=10.1

........

Z= kx15/22

Z=10.1x15/12

Z=12.625

7 0

2 years ago

PLEASE HELP ME WITH Q 1. a) b)

diamong [38]

A calculate the bounce height for each and work out the total

b do it again and use a stopwatch and calulate. Hope this helped

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2 years ago

5(-3y+3z)-3(-5z-y) simplified

Virty [35]

Answer:

5-(-3y+3z)-3(-5z-y) = 6y+12z+5

Step-by-step explanation:

5−(−3y+3z)−3(−5z−y)

Distribute:

=5+3y+−3z+(−3)(−5z)+(−3)(−y)

=5+3y+−3z+15z+3y

Combine Like Terms:

=5+3y+−3z+15z+3y

=(3y+3y)+(−3z+15z)+(5)

=6y+12z+5

8 0

2 years ago

Previous Question Question 14 of 20 Next Question A company randomly surveys 15 VIP customers and records their customer satisfa

Ann [662]

Answer:

71.4699, 81.7301.

Step-by-step explanation:

So, the following are the scores: 74

$Let,\;the\;total\;sum\;of\;the\;scores\;be:\sum x =1149$

$Then,\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\sum x^2=89795$

The length of the score : 15

Then, let the size of the scores be n : 15.

Then, we have to find the mean.

$\bar{x}=\frac{\sum x}{n}$

$=\frac{1149}{15}=76.6$

$Then,\;we\;have\;to\;find\;standard\;deviation:S=\sqrt{\frac{\sum x^2-n.(\bar{x})^2}{n-1} }$

$=\sqrt{\frac{89795-15\times(76.6)^2}{15-1} }=11.2808$

$The\;degree\;of\;freedom:n-1=14$

$So,\;the\;significant\;level:\alpha=1-0.90=0.10$

$and\;the\;critical\;value:t_{\frac{\alpha}{2} }=1.7613$

$Finally:\\=\bar{x}\;\pm\;t_{\frac{\alpha}{2} }\;\frac{S}{\sqrt{n} }\\=(71.4699, 81.7301)$

6 0

2 years ago