What the answer for 11 help me pls

Ron has 75 blue marbles and 125 red marbles. Enter the percent of blue marbles as a part of all marbles.

Ann [662]

Answer:

Step-by-step explanation:

% = Red / (Blue + red ) * 100

% = 75/(125 + 75) * 100

% = 75 / 200 * 100

% = 7500 / 200 = 37.5% are blue

5 0

3 years ago

Duane rode his bike at 14 miles per hour for 3 hours, then put the bike down and began walking at miles 2 per hour. Elizabeth st

Colt1911 [192]

Elizabeth will take 9 hours and 45 minutes to catch up with Duane using the given speed-distance-time values.

The speed-distance-time relations are:

Speed = Distance/Time, Distance = Speed*Time, and Time = Distance/Speed.

The distance traveled by Duane on the bike at 14 miles per hour for 3 hours = 14*3 miles = 42 miles.

The time that Elizabeth takes to cover 42 miles jogging at 5 miles per hour = 42/5 hours = 8.4 hours.

The distance traveled by Duane in the extra time which Elizabeth took to reach his bike (8.4 - 3 = 5.4 hours) walking at 2 miles per hour = 2*5.4 = 10.8 miles.

Now, the distance between Elizabeth and Duane is 10.8 miles, before Elizabeth starts riding the bike.

Keeping the distance constant, we calculate the relative speed to calculate the time to cover this distance.

Relative speed = Elizabeth's speed - Duane's speed {As Elizabeth is moving towards Duane, that is, covering the distance but Duane is moving away from Elizabeth, that is, increasing the distance}.

or, Relative speed = 10 - 2 = 8 miles per hour.

Time taken to cover the distance = 10.8/8 = 1.35 hours.

Therefore, the total time taken by Elizabeth to catch up with Duane = 8.4 + 1.35 hours = 9.75 hours or 9 hours and 45 minutes.

Learn more about the speed-distance-time relations at

brainly.com/question/4931057

#SPJ4

4 0

2 years ago

I NEED HELP PLEASE PLEASE

Aliun [14]

Answer:

length= 17.5

width=11.5

( I worked this out myself but I don't know if its right tho)

5 0

3 years ago

Simplify (2 − + 1) + 5 and find its value for a = -2.

zloy xaker [14]

Answer:

Part A

a·(a² - a + 1) + 5·a = a³ - a² + 6·a

Part B

The value of a·(a² - a + 1) + 5·a, for a = -2 is -24

Step-by-step explanation:

Part A

The given function is a·(a² - a + 1) + 5·a

The function is simplified by expanding the product of sums into sums of products, as follows;

a·(a² - a + 1) + 5·a = a × a² - a × a + a × 1 + 5·a = a³ - a² + a + 5·a = a³ - a² + 6·a

The function, a·(a² - a + 1) + 5·a, in simplified format is therefore;

a·(a² - a + 1) + 5·a = a³ - a² + 6·a

Part B

When a = -2, we get;

(a³ - a² + 6·a) $_{a = 2}$ = (-2)³ - (-2)² + 6·(-2) = -8 - 4 - 12 = -24

7 0

3 years ago

Simplify the expression: 5(1 + 8d)

Rina8888 [55]

Answer:

5 + 40 d

Step-by-step explanation:

Hey there,

To simply this you have to multiply each term in the brackets by 5.

$5(1+8d)$

$5+40d$

Further explanation

5 ( 1 + 8 d )

5 × 1 + 5 × 8 d

5 +40 d

Hope this helps you.

Let me know if you have any other question :-)

5 0

2 years ago

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