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2 years ago

15

Last year the chess club had 20 members. This year the club has 15 members. Find the percentage of change and state whether the

percent of change is an increase or decrease

1 answer:

AlekseyPX2 years ago

8 0

15/20=.6
1-.6=.4
It decreased 40% since last year <span />

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Depth: 1.8 m Width: 2.5 m Height: 2 m What is the cuboid's volume?

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Answer:

9 m³

Step-by-step explanation:

The formula for calculating the volume (V) of a cuboid is

V = depth × width × height

= 1.8 × 2.5 × 2 = 9 m³

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2 years ago

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The number of square feet per house is normally distributed with a population standard deviation of 154 square feet and an unkno

11111nata11111 [884]

Answer: (1500.66,1599.34)

Step-by-step explanation:

Confidence interval for population mean:

$\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}$

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As per given , we have

n= 16

$\sigma = 154$ square feet

$\overline{x}= 1550$ square feet

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Critical z-value = $z_{\alpha/2}=z_{0.2/2}=z_{0.1}=1.2815$

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$1550\pm (1.2815)\dfrac{154}{\sqrt{16}}\\\\ = 1550\pm (1.2815)\dfrac{154}{4}\\\\= 1550\pm 49.33775\\\\ =(1550-49.33775,\ 1550+49.33775)\\\\\approx (1500.66,\ 1599.34)$

Required confidence interval: (1500.66,1599.34)

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2 years ago

A gate is 3 feet tall and casts a shadow 5 feet long. At the same time, a nearby building is 27 ft tall. If this is to be a prop

madam [21]

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the length of the shadow is 45 feet long

Step-by-step explanation:

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2 years ago

Does someone mind helping me with this problem? Thank you!

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Answer:

875 ft²

Step-by-step explanation:

Finding area of similar rectangles:

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$\sf \dfrac{Area \ of \ bigger \ rectangle}{Area \ of \ smaller \ rectangle}= (Scale \ factor)^2$

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1 year ago

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Help. also explain :) please

Anuta_ua [19.1K]

The answer is £140

First you find 20% of 1200 (which is basically 20 times 12) which gives you £240.

You add £240 to £1200 which is £1440

Then you take £300 off £1440 since he already paid the deposit.

That leaves you with £1140

1140 divided by 10 is 114

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2 years ago