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2 years ago

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Mathematics

1 answer:

makvit [3.9K]2 years ago

3 0

Option A. The scores on the quiz for class a have more variability than the scores for class b

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Help!! help!! help!! help!! help!! help!! help!! help!! help!!

oksian1 [2.3K]

Answer:

(8.21, -20.79)

Step-by-step explanation:

Given the simultaneous equation;

$\frac{a}{b} - \frac{b}{2} = 10\\a - b = 29$

From 2;

a = 29 + b ....3

Substitute 3 into 1;

$\frac{29+b}{b} - \frac{b}{2} = 10\\\frac{2(29+b)-b^2}{2b} = 10\\\frac{58+2b-b^2}{2b} = 10\\58+2b-b^2 = 20b\\b^2-2b-58 = -20b\\b^2-2b+20b -58 = 0\\b^2+18b-58 = 0\\$

Factorize

b = -18±√18²-4(-58)/2

b = -18±√324+232/2

b = -18±√556/2

b = -18±23.58/2

b = -18-23.58/2 and -18+23.58/2

b = -41.58/2 and 5.58/2

b = -20.79 and 2.79

Since a = 29 + b

when b = -20.79

a = 29 - 20.79

a = 8.21

Hence the solution to the system of equation is (8.21, -20.79)

7 0

2 years ago

Use <, >, or = to fill in the blanks. -7----- 0 Please help me!

Oduvanchick [21]

Answer:

Step-by-step explanation:

3 0

2 years ago

Simplify: |3−8|−(12÷3+1)2

Nonamiya [84]

Answer:

|3-8|-(12/3+1)2

=|-5|-(4+1)2

=5-5x2

=5-10

=-5

You said simplify, but it can be solve.

7 0

3 years ago

Read 2 more answers

Solve the equation x2 18x + 21 = -3x to the nearest tenth.

Bumek [7]

Answer:

1x=-29

2x=-1

Step-by-step explanation:

i hope its useful.

7 0

2 years ago

Jenny has some flowers in a bucket. She picks a flower at

saul85 [17]

Answer:

Each flower is either red or yellow. Each flower is either a tulip or a rose. For these flowers number of tulips:number of roses 6 : 5.

Step-by-step explanation:

6 0

2 years ago