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FrozenT [24]
3 years ago
13

The first square number is 1, and the sum of the first 20 square numbers is 2870.

Mathematics
1 answer:
musickatia [10]3 years ago
7 0
21²=21×21
21×21=441

2,870+441=3,221
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2
kotykmax [81]

Answer:

16.5 hours

Step-by-step explanation:

The bicycle costs $240.  Eva already has $42.  She is making $12 per hour.

240 = 12x + 42

Solve for x to find out how many hours Eva needs to work to buy the bicycle.

240 = 12x + 42

240 - 42 = (12x + 42) - 42

198 = 12x

198/12 = (12x)/12

16.5 = x

Eva needs to work 16.5 hours to be able to buy the bikw.

6 0
3 years ago
Find the solution set of the quadratic equation over the set of complex numbers.
blagie [28]
Step 1: Multiply 5x2 = 10 so the equation after the first step should look like this 10 + 12x + 8 = 0.

Step 2: Subtract 10 from the 8 and the number by itself cause whatever you do to one side you must do to the other. so the equation should look like this after the second step 12x + -2 = 0 because we subtracted the 10 and the 8.

Step 3: Now we must add the 2 to both sides because we have to do the inverse operation in this problem so once we've done this it should end up looking like this after the 3rd step 12x = 2 because the 2 was a negative.

Step 4: the final step we must divide since an anytime we have a number next to a variable it means multiply but since were using order of operations we have to do the opposite/inverse operation in this problem and we would divide 12 by 2 and get our final answer as x = -6 because the 12 would cancel itself out leaving us with 2 divided by 12 which is 0.16 or -6 depending on if you want it simplified or not the simplified answer would be 0.16 and the non simplified version would be -6
4 0
3 years ago
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An 18-foot board is leaning against a wall. It is set 6 feet from the base of the wall. How far up the wall does the board reach
pav-90 [236]

Answer: 19

Step-by-step explanation:

8 0
3 years ago
What is 2491 divided by 53
Darina [25.2K]

Answer:

47

Step-by-step explanation:

6 0
3 years ago
What is the length of the dotted line? Round to the nearest hundredth.
prohojiy [21]

Answer:3.75

Step-by-step explanation:

I think that’s it

5 0
3 years ago
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