2 years ago

100 POINTS AND BRAINLIEST!! PRE CALC!

Mathematics

1 answer:

Elenna [48]2 years ago

3 0

Refer to the pic above.

Concepts used :

1. Trigonometric Properties

2. Domain limitation

3. assumption

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Kathy distributes jelly beans among her friends. Alia gets 4^2 fewer jelly beans than Kelly, who gets 3^3 jelly beans. How many

pogonyaev

D.

Kelly got 3^3 (27) while Alia got 4^2 (16) less than her. When you put it together you get 3^3 - 4^2

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3 years ago

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An auto dealership sells minivans and sedans. In January, they sold 10 minivans and 20 sedans. In February, they sold 7 minivans

zaharov [31]

Answer:

january = 10/20 = 1/2

februry = 7/14 = 1/2

so, we conclude that the auto dealership didn't have a lower ratio, since the ratio is equal in both months.

hope it helps :)

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2 years ago

Which of the following sets of numbers could represent the three sides of a right triangle?

sweet-ann [11.9K]

Answer:

(45,60,75)

Step-by-step explanation:

Because 45^2 + 60^2 = 75^2

5625 = 5625

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2 years ago

Simplify. Enter your answer, in simplest radical form, in the box.

puteri [66]

24.75 rounded might be 25

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3 years ago

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2. Determine the sum of the first 400 ODD numbers.

il63 [147K]

Odd numbers take the form $2n-1$ , where $n\ge1$ is an integer. When $n=400$ , the last odd number would be 799. So we're adding

$S=1+3+5+\cdots+795+797+799$

By reversing the order of terms, we have

$S=799+797+795+\cdots+5+3+1$

and we can pair up terms in both sums at the same position to write

$2S=(1+799)+(3+797)+(5+795)+\cdots(795+5)+(797+3)+(799+1)$

so that we are basically adding 400 copies of 800, and from there we can find the value of the sum right away:

$2S=400\cdot800\implies S=160,000$

###

We could also make use of the formulas,

$\displaystyle\sum_{i=1}^n1=n$

$\displaystyle\sum_{i=1}^ni=\dfrac{n(n+1)}2$

We have

$S=\displaystyle\sum_{i=1}^{400}(2i-1)=2\sum_{i=1}^{400}i-\sum_{i=1}^{400}1=400(400+1)-400=400^2=160,000$

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3 years ago