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3 years ago

Solve by square roots: 2x squared +11 = 131

Mathematics

1 answer:

elena55 [62]3 years ago

6 0

Answer:

x = ± 2 $\sqrt{15}$

Step-by-step explanation:

Given

2x² + 11 = 131 ( subtract 11 from both sides )

2x² = 120 ( divide both sides by 2 )

x² = 60 ( take the square root of both sides )

x = ± $\sqrt{60}$ = ± $\sqrt{4(15)}$ = ± 2 $\sqrt{15}$

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3 years ago

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3 years ago

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Use the formula to evaluate the series 1+2+4+8+...a10

valina [46]

Answer:

The sum of the given series is 1023

Step-by-step explanation:

Geometric series states that a series in which a constant ratio is obtained by multiplying the previous term.

Sum of the geometric series is given by:

$S_n = \frac{a(1-r^n)}{1-r}$

where a is the first term and n is the number of term.

Given the series: $1+2+4+8+.................+a_{10}$

This is a geometric series with common ratio(r) = 2

We have to find the sum of the series for 10th term.

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3 years ago

A recipe for brownies calls for 2/3 Cup of chocolate chips for a batch of two dozen brownies. How many chocolate chips will be n

vovikov84 [41]

Answer:

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Step-by-step explanation:

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4 years ago

While preparing for a party a party planner began with 75 pieces of candy she ate 5 pieces while she was working then she put eq

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She puts the same amount in each of 10 bags... so we divide 70 by 10 to find the # of pieces in each bag.

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She put 7 pieces in each bag.

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4 years ago