i sped up im prob wrong but 1?

solve this

1 + cos (4x) + cos(8x) + cos(12x)....+ (cos nx).

Oh my god..... I'm only a fourth grader DX Anyway, 4x8=32, and 32x12=384 And I don't know what cos is, so I'm guessing 384 (I know it's wrong) :I

98x43=? (Double multipulcation) :3

4214.

(x - h)² + (y - k)² = r²
(h , k) = center
r = radius
find both answers for y if the equation is (x - 3)² - (y + 2)² = 4².

<<skip idk that problem>>
100,683,482,100 X 123,693,100,567

LOL the answer is 1!

9 x A

(A = 3/8)

50 x 32 = 1600
123 - 56 = 67

1600 + 67 = 1667

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There are ten cookies in a jar. 2 of them are chocolate chip, 4 of them are peanut butter and 2 of them are coconut.
what is the fraction of peanut butter cookies in the jar?

4
----
10

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what is 8 x 8 + 10

answer should be = 40ef since e and f are variables.

(90-1)3^3 = ?
801

Ummm idk....\:

350% of 10. EAZY!

35..?

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imma give an easy one
4x0

0

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25 - 9 + 87 * 3

277

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9 + 10

t-t-t-nineteen.

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6 + 9 =

15

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20 * 19

380

360 / (3+X) = 40
Solve for X

My 6th grade brain cannot comprehend this easily.....Uhhh, 360 / (3 + 87) = 40

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20 * 19 + -31

349
The answer was 6, because if the X was 87, the equal would be 4


3+1-5*9+4/5-8+7*0/2