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podryga [215]
3 years ago
7

mary is 3 years less than twice as old as her sister. mary is 11 years old. write and solve an algebraic equation to find mary’s

sisters age.
Mathematics
1 answer:
Lady bird [3.3K]3 years ago
4 0
(11x2)-3 is the algebraic equation
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Click on all the points that are solutions to y = x^2 - 9.
Oliga [24]

9514 1404 393

Answer:

  B) (2, -5)

  D) (3, 0)

Step-by-step explanation:

I find it convenient to let a graphing calculator plot the points and the graph.

The only two points on the graph of the curve are ...

  (2, -5) and (3, 0)

3 0
3 years ago
A school debate team has four girls and six boys. A total of four of the team members will be chosen to participate in the distr
alex41 [277]
Procedure:

1) calculate the number of diferent teams of four members that can be formed (with the ten persons)
2) calculate the number of teams tha meet the specification (two girls and two boys)
3) Divide the positive events by the total number of events: this is the result of 2) by the result in 1)

Solution

1) the number of teams of four members that can be formed are:

10*9*8*7 / (4*3*2*1) = 210

2) Number of different teams with 2 boys and 2 girls = ways of chosing 2 boys * ways of chosing 2 girls

Ways of chosing 2 boys = 6*5/2 = 15
Ways of chosing 2 girls = 4*3/2 = 6

Number of different teams with 2 boys and 2 girls = 15 * 6 = 90

3) probability of choosing one of the 90 teams formed by 2 boys and 2 girls:

90/210 = 3/7
 
7 0
3 years ago
Quantity (Bottles of Cleanser) Cost
seraphim [82]

Answer:

D. 8 bottles

Step-by-step explanation:

one bottle of one is obviously $6.50

one bottle of two : $12.50 (1/2) = $6.25

one bottle of four: $26.00 (1/4) = $6.50

one bottle of six: $30.00 (1/6) = $5.00

one bottle of eight: $38.00 (1/8) = $4.75

8 bottles is the best buy

3 0
3 years ago
Read 2 more answers
Use an addition or subtraction formula to find the exact value of the expression, as demonstrated in example 1. tan(105°)
strojnjashka [21]
Use an addition or subtraction formula to find the exact value of the expression, as demonstrated in example 1. tan(105°)

7 0
3 years ago
A salespersons commission rate is 4% what is the commission from the sale of $36,000 worth of furnaces use pencil and paper supp
Mnenie [13.5K]

Answer:

1440

Step-by-step explanation:

36,000x0.04=1440

7 0
3 years ago
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