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ycow [4]
3 years ago
6

Pls help thank you!! 7th grade math

Mathematics
1 answer:
monitta3 years ago
4 0

Answer:

Pls help thank you!! 7th grade math

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Sandra swims the 100-meter freestyle for her school’s swim team. Her state’s ranking system awards 3 points for first place, 2 p
Elina [12.6K]

Answer:

2.25

Step-by-step explanation:

The total frequency is:

20 + 12 + 6 + 2 = 40

Calculate the probability of each score:

P(X=3) = 20/40 = 0.50

P(X=2) = 12/40 = 0.30

P(X=1) = 6/40 = 0.15

P(X=0) = 2/40 = 0.05

So the expected value is:

E = (3)(0.50) + (2)(0.30) + (1)(0.15) + (0)(0.05)

E = 2.25

5 0
3 years ago
a furniture store is having a weekend sale and is offering a 20% discount on patio chairs and tables.the sales tax on furniture
Yuliya22 [10]
A = x(0.2) + 6.25x I believe
7 0
4 years ago
Nadia is a stockbroker. She earns 12​% commission each week. Last​ week, she sold ​$7,200 worth of stocks. How much did she make
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Answer:

864

Step-by-step explanation:

6 0
2 years ago
Use slopes to determine if the triangle whose vertices are left parenthesis negative 3 comma 3 right parenthesis​, left parenthe
olya-2409 [2.1K]

Answer:

Step-by-step explanation:

vertices are A(-3,3),B(-2,4),C(4,0)

slope of AB=(4-3)/(-2+3)=1/1=1

slope of BC=(0-4)/(4+2)=-4/6=-2/3

slope of CA=(3-0)/(-3-4)=-3/7

two lines are perpendicular if product of slopes=-1

so it is not a right angled triangle .

4 0
4 years ago
Read 2 more answers
Abbey wants to use her savings of $1,325 to learn yoga. The total charges to learn yoga include a fixed registration fee of $35
Brums [2.3K]
So for this, this can be written into the equation y=50x+35 (x = number of months, y = total cost).

To solve this problem, we need to plug in 1325 into the y-variable and solve from there.

1325=50x+35

Subtract 35 on each side to get 1290=50x

Then just divide by 50 on each side, and your answer should be 25.8=x


And because we cannot go past budget, we will have to round down to 25. In context, the maximum amount of months Abbey can do is 25 months.
8 0
3 years ago
Read 2 more answers
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