3 years ago

Select the correct answer from each drop-down menu.

Mathematics

1 answer:

o-na [289]3 years ago

4 0

Answer:

The two grades that have a proportional relationship between the numbers of girls and boys are and grade 6 and 8

Step-by-step explanation:

Girls: Boys

9 : 12 (grade 6)

15 : 20 (grade 8)

3 : 4

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Which statement about a dilation with a scale factor of 3 is true?

xxMikexx [17]

Answer:

C. Each side in the pre-image is multiplied by three to find the corresponding side length in the image.

Step-by-step explanation:

The scale factor multiplies every linear dimension in the pre-image. It is the ratio of image dimensions to pre-image dimensions.

So, for a scale factor of 3, each side in the pre-image is multiplied by 3.

3 0

4 years ago

Can you help me solve this please

OLga [1]

Answer:

-22+27i

Step-by-step explanation:

$i = \sqrt{ - 1} \\ (3 - 4i)( - 6 + i) \\ = (3 - 4 \sqrt{ - 1} )( - 6 + \sqrt{ - 1} ) \\ = 3( - 6 + \sqrt{ - 1)} - 4 \sqrt{ - 1} ( - 6 + \sqrt{ - 1} ) \\ = - 18 + 3 \sqrt{ - 1} + 24 \sqrt{ - 1} - 4 \\ = - 22 + 27 \sqrt{ - 1} \\ putting \: \: \: \sqrt{ - 1 } = i \\ = - 22 + 27i$