3. In a group of students of them are Science Club members and the rest are Mathematic

Mathematics

1 answer:

stellarik [79]3 years ago

5 0

Answer:

There are six boys in math club

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Karen is seven years older than suzanne.Four years ago,karen was twice as old as suzanne was.How are they now?

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$K-Karen\ age\\S-Suzanne\ age\\K-4-Karen\ age\ 4\ years\ ago\\S-4-Suzanne\ age\ 4\ years\ ago\\\\ \left\{\begin{array}{ccc}K=S+7\\K-4=2(S-4)\end{array}\right\\\left\{\begin{array}{ccc}K=S+7&(1)\\K-4=2S-8&(2)\end{array}\right\\\\subtitute\ (1)\ to\ (2):\\\\(S+7)-4=2S-8\\S+7-4=2S-8\\S+3=2S-8\ \ \ \ |subtract\ 3\ from\ both\ sides\\S=2S-11\ \ \ |subtract\ 2S\ from\ both\ sides\\-S=-11\\\boxed{S=11}$

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3 years ago

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Johnathan plans on using 2" x 12" boards that cost $2.50 per foot. Assuming he can purchase the exact amount he needs, how much

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$35

Step-by-step explanation:

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3 years ago

Please solve 7(b=2) = 49

Luden [163]

Here is your answer
Please mark it brainliest

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3 years ago

An accountant invested $5000 at a simple interest rate of 8% for 2 years. What total amount of money will she have from her inve

il63 [147K]

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Step-by-step explanation:

you have to muliyiply everything so 5000*.08*2 which is 800 now add that to 5000 because thats the amount she put in so it will be $5800.

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Find the surface area of the cylinder. Use a ~ 3.14 20 m

lesantik [10]

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1444.4 m2

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Surface Area = 2 * 3.14 * (R*R + R*L) = 2 * 3.14 * (10*10+10*13) = 1444.4 m2

Note .. You can Derive this

"Surface Area = 2 * 3.14 * (R*R + R*L)"

Using Calculus by differentiating its Volume

V = 3.14 * R * R * L

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