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1 year ago

[please answer quickly] it takes 8 hours to paint a room. how long will it take to paint 2/3 of the room?

Mathematics

1 answer:

Lunna [17]1 year ago

7 0

Answer:

5 hours 20 minutes.

Step-by-step explanation:

8 * 2/3

= 16/3

= 5 1/3

= 5 hours 20 minutes.

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Brianna has x nickels and y pennies. She has no less than 20 coins worth no more

Bond [772]

Answer:

$y \ge 20 - x$

$y \le 80 -5x$

$(x,y) = (15,5)$

Step-by-step explanation:

Given

$Nickels = x$

$Pennies = y$

$Amount = \$0.80$ maximum

$Coins = 20$ minimum

Required

Solve graphically

First, we need to determine the inequalities of the system.

For number of coins, we have:

$x\ +\ y\ge 20$ because the number of coins is not less than 20

For the worth of coins, we have:

$0.05x\ +\ 0.01y\ \le0.80$ because the worth of coins is not more than 0.80

So, we have the following equations:

$x\ +\ y\ge 20$

$0.05x\ +\ 0.01y\ \le0.80$

Make y the subject in both cases:

$y \ge 20 - x$

$0.01y \le 0.80 - 0.05x$

Divide through by 0.01

$\frac{0.01y}{0.01} \le \frac{0.80}{0.01} -\frac{ 0.05x}{0.01}$

$y \le \frac{0.80}{0.01} -\frac{ 0.05x}{0.01}$

$y \le 80 -5x$

The resulting inequalities are:

$y \ge 20 - x$

$y \le 80 -5x$

The two inequalities are plotted on the graph as shown in the attachment.

$y \ge 20 - x$ --- Blue

$y \ge 80 -5x$ --- Green

Point A on the attachment are possible solutions

At A:

$(x,y) = (15,5)$

4 0

2 years ago

How do you solve 39 equal to 1 3/10b

elena-s [515]

If 39 = (1 3/10)b, we could simplify this by writing 39 - (13/10)b.

Solve this for b by mult. both terms by (10/13):

(10*39)
----------- = (10/13)(13/10)b. Then b = 30 (answer)
13

5 0

2 years ago

Pls help with this question I give brainliest thank uuuuu!

Snezhnost [94]

Answer:

B. 88.5

Step-by-step explanation:

first we add all the numbers :

(79 +80 +92 +92 +81 +100 +88 +98 +71 + 100+91+90) over 12

= 1062 over 12

= 88.5

[why over 12? because there's 12 numbers]

8 0

3 years ago

Which figure shows a reflection of pre-image QRS over the line t?

Igoryamba

Answer:

A, because its reflecting off of the y axis

Step-by-step explanation:

I have proof links, and I took the test

4 0

3 years ago

A triangular prism. The base of a triangular side is shaded. What are the possible shapes of cross sections of this figure? A cr

Alexxandr [17]

Answer:

the first one is triangle and the second one is rectangle

Step-by-step explanation:

i just did it on edge

3 0

2 years ago

Read 2 more answers