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nalin [4]
3 years ago
15

Help again 14 more questions

Mathematics
1 answer:
MArishka [77]3 years ago
5 0

Answer:

A certain element has 25 protons.

Step-by-step explanation:

Please mark brainliest

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If the exterior angle of a regular polygon is 15 degree, find the central angle ?
Ugo [173]

Answer: 360/15=24 sides

Step-by-step explanation:

6 0
3 years ago
Help!!!<br><br><br>2814 divided by 7
dexar [7]
2814÷7= 402.
hope this helps!
7 0
3 years ago
Read 2 more answers
Find the sum of first 15 terms of an AP whose 4th and 9th t terms are -15 and -30 respectively.
Serga [27]

Answer:

Sum of the first 15 terms = -405

Step-by-step explanation:

a + 3d = -15 (1)

a + 8d = -30 (2)

Where,

a = first term

d = common difference

n = number of terms

Subtract (1) from (1)

8d - 3d = -30 - (-15)

5d = -30 + 15

5d = -15

d = -15/5

= -3

d = -3

Substitute d = -3 into (1)

a + 3d = -15

a + 3(-3) = -15

a - 9 = -15

a = -15 + 9

a = -6

Sum of the first 15 terms

S = n/2[2a + (n − 1) × d]

= 15/2 {2×-6 + (15-1)-3}

= 7.5{-12 + (14)-3}

= 7.5{ -12 - 42}

= 7.5{-54}

= -405

Sum of the first 15 terms = -405

7 0
3 years ago
What is the product? to (5r+2)(3r-4)
Nady [450]

using distributive property you should get

15r  ^{2}  - 14r - 8

6 0
3 years ago
Patricia went to lunch with friends. She ordered soup and a salad for $11.75. The tax was 5.8%. What was the total amount Patric
VladimirAG [237]

Answer:

12.43

Step-by-step explanation:

5 0
2 years ago
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