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Xelga [282]
2 years ago
15

Find the sum of the first 40 even positive integers.

Mathematics
1 answer:
Pachacha [2.7K]2 years ago
6 0

Answer:

1640

Step-by-step explanation:

Even, positive integers

2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50+52+54+56+58+60+62+64+66+68+70+72+74+76+78+80 = 1640

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Tires have a normal distribution with a mean of 70000 miles and a standard deviation of 4400 miles. What proportion of tires wil
yarga [219]
Let T = the distance, in miles, a tire lasts

T ~ N(70000,4400<span>²</span>)

P(T \geq 75000) 
 = P(Z \geq \frac{75000 - 70000}{4400})
 = P(Z \geq \frac{25}{22})
 ≈ P(Z \geq 1.14)
 = 1 - P(Z < 1.14)
 ≈ 1 - 0.8729
 = 0.1271
5 0
3 years ago
The Fort Worth Zoo had 6,195 visitors last week. The zoo is open seven days a
umka21 [38]

Answer:

Step-by-step explanation:

From the problem statement, we can setup the following equation:

7N = 6195

where N is the number of people that would show up to the zoo on a given day.

Dividing both sides by 7 will give us the answer:

N = 885

3 0
3 years ago
34. Make Sense and Persevere Stay Fit gym
Evgesh-ka [11]

Answer:

15 classes

Step-by-step explanation:

Let

x -----> the number of class

y ----> the total amount in charges

we know that

The total charge is equal to the number of class multiplied by the additional fee plus the membership fee (only members)

so

<em>Members</em>

y=3x+75 -----> equation A

<em>Non Members</em>

y=8x -----> equation B

Equate equation A and equation B

8x=3x+75

Solve for x

8x-3x=75

5x=75

x=15

7 0
3 years ago
The ratio of the boys to girls in the cafeteria is 5:6. if there are 25 more girls than boys, how many total students are in the
Black_prince [1.1K]
I think it's 55 in total
7 0
3 years ago
Read 2 more answers
Which relationship describes angles 1 and 2?
Zolol [24]

Answer:

complementary angles

Step-by-step explanation:

∠1 and ∠2 form a right angle and are complementary, that is they sum to 90°

7 0
3 years ago
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