MATHEMATICS MIDDLE SCHOOL

What is f(x) when x = 3?

Answers

Answer 1

Answer:

Answer:

You can find value of the function f(x) by putting the value of x(3) into the equation

ex/. f(x)=4x+1

if x=3, enter 3 into the function

f(3)=4(3)+1

f(3)=12+1

f(3)=13

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Don saves $1 the first week, 2$ the second week, $3 the third week, and $4 the fourth week. If he continues in this way, how many weeks will it take before Don has saved at least $50?Please show me the simplest and quickest way to solve this problem. EXPLAIN YOUR STEPS THOROUGHLY!!

Answers

This forms an arithmetic sequence, where the first term = 1, common difference = 1, and number of terms = n.

The formula for the sum of an arithmetic sequence is

$S_(n) = (1)/(2)n(2a + (n - 1)d)$

Where a = the first term and d = the common difference.

We want the sum to be at least $50, so
$50 \leq (1)/(2)n(2a + (n - 1)d)$

Substituting in a and d
$50 \leq (1)/(2)n(2(1) + (n - 1)(1))$

Rearranging
$50 \leq (1)/(2)n(2 + (n - 1))$
$50 \leq (1)/(2)n(1 + n)$
$100 \leq n(1 + n)$
$100 \leq n^2 + n$
$0 \leq n^2 + n - 100$

$\text{Let } n^2 + n -100 = 0$
$n = (-1 \pm √(1-4(1)(-100)))/(2)$
$n = (-1 \pm √(401))/(2)$
$n \geq 0 \implies n = (-1 + √(401))/(2)$
$n \approx 9.51$

So it will take 9.51 weeks, or 10 weeks to the nearest week.

$15 lunch; 20% tip what's your total
please help

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18$ bc 20% of 15 is 3 so, 15+3=18

tip amount=$3.00
total to pay=$18.00
total per person=$18.00

I need help with simply the number please

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7 + $(2(5-2)2)/(4)$

7 + $(2(5-2))/(2)$

7+5-2

12-2 = 10

A number x increased by 6 and the the sum is doubled

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That can be expressed as 2(x+6).

Uhhhhmm...Help please? ;w;

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Answer:

the answer is c

Step-by-step explanation:

all you do is divide the top by the bottom

Answer:

The answer is C.

Step-by-step explanation:

If you use a fraction calculator, it will tell you the decimal for the fraction.

HOPE THIS HELPS :)

The length of a chalkboard is 5 feet.the width is 10 ft. mr Jones has 20 feet of string to place around it. Ms coley cuts off 3 feet of the decoration, will there be enough string to place around the chalkboard?

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Mr jones does not have enough string to place around the chalkboard

Answer:

nope he doesn't

Step-by-step explanation:

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