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4 years ago

This is part of Zalika's homework

Mathematics

2 answers:

Sonbull [250]4 years ago

8 0

Answer:

The units of the two shapes are not the same one is in cm the other in mm

Step-by-step explanation:

1cm=10mm

15÷10=1.5cm

12÷10=1.2cm

1.2×1.5=1.8

72- area of B

Area of B take away the area of A

72- 1.8

Answer=70.2cm

gregori [183]4 years ago

4 0

Answer:

A) She did not covert them in the same unit before taking the difference

B) 72 - (180/100) = 70.2 cm²

Or,

(72×100) - 180 = 7020 mm²

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Ilia_Sergeevich [38]

Just work this problem out backwards. First write out an equation.
(x+4)•3=30

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3 years ago

Charles and Lisa were having a watermelon eating contest. They ate twelve slices of watermelon between the two of them. Lisa ate

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3 years ago

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Write Y=4/5 x+8 in standard form using intergers

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Answer:

B. -4x+5y=40

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3 years ago

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A researcher claims that the variation in the salaries of elementary school teachers is greater than the variation in the salari

guajiro [1.7K]

Answer:

The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

$F_{critical} = 1.8608$

$F = 2.9085$

The decision rule is

Reject the null hypothesis

There is sufficient evidence to support the researchers claim

Step-by-step explanation:

From the question we are told that

The first sample size is $n_1 = 30$

The sample variance for elementary school is $s^2_1 = 8324$

The second sample size is $n_2 = 30$

The sample variance for the secondary school is $s^2_2 = 2862$

The significance level is $\alpha = 0.05$

The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

Generally from the F statistics table the critical value of $\alpha = 0.05$ at first and second degree of freedom $df_1 = n_1 - 1 = 30 - 1 = 29$ and $df_2 = n_2 - 1 = 30 - 1 = 29$ is