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3 years ago

9

there are six blades on each windmill. How many total blades are on seven windmills? Use a fives fact to solve.plzzz help me plz

z!!!!!!

2 answers:

astra-53 [7]3 years ago

6 0

Well 6*7 = 42 .....//...

mr Goodwill [35]3 years ago

5 0

The way to solve this is 6 times 7 which is 42.

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The number of rows in the arena is 26

<h3>How to determine the number of rows?</h3>

The hockey arena illustrates an arithmetic sequence, and it has the following parameters:

First term, a = 220
Sum of terms, Sn = 10920
Common difference, d = 16

The number of rows (i.e. the number of terms) is calculated using:

$S_n = \frac{n}{2}(2a + (n -1) * d)$

So,we have:

$10920 = \frac{n}{2}(2 * 220 + (n -1) * 16)$

Evaluate the terms and factors

$21840 = n(440 + 16n -16)$

Evaluate the like terms

21840 = n(424+ 16n)

Expand

21840 = 424n + 16n^2

Rewrite as:

16n^2 + 424n - 21840 = 0

Using a graphical tool, we have:

n = 26

Hence, the number of rows in the arena is 26

Read more about arithmetic sequence at:

brainly.com/question/6561461

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2 years ago

21 less than tree-fifths of a number

MissTica

Answer:

$\frac{3}{5}x - 21$

Step-by-step explanation

Three-fifths of a number means $\frac{3}{5}x$ and 21 less than that number means $\frac{3}{5} x - 21$ .

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Rafael counted a total of 40 white cars and yellow cars there were 9 times as many white cars as yellow how many white cars did

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Answer:

Uhhhh si he counted 40 cars so just do 40 times 9 which is 360

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If tan a = 9／40<br>use trigonometric identities to find the values of sin a and cos a.

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Answer:

see explanation

Step-by-step explanation:

Given

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sin a = $\frac{opposite}{hypotenuse}$ = $\frac{9}{41}$

cos a = $\frac{adjacent}{hypotenuse}$ = $\frac{40}{41}$

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