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3 years ago

It takes 2/5 of an hour to paint a wall. How many walls could you paint in 4 1/2 hours?

Mathematics

1 answer:

guajiro [1.7K]3 years ago

5 0

Answer:

Easy! Put away your slide ruler! Just take one painter. He takes one hour to paint 1/3 of a wall.. Boy these guys must be in the union for they are really slow.. so lets assume one painter painted all 8 walls. That is a lot of cigarette breaks, it would take him 24 hours to paint all 8 walls…. But he has 3 other buddies… yea! so 4 into 24 = 6 Hours!

Step-by-step explanation:

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A 25-inch television has a screen that is 15 inches high. How wide is the screen? inches

Firdavs [7]

Answer:

20 inches

Step-by-step explanation:

Use the Pythagorean Theorem.

$a^2 + b^2 = c^2\\15^2 + b^2 = 25^2\\225 + b^2 = 625\\b^2 = 400\\b = \sqrt{400} \\b = 20$

8 0

2 years ago

Explain why 0.3 x 0.9 doesn't equal 2.7

-BARSIC- [3]

Answer:

equals 0.27

because of the 0

Step-by-step explanation:

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3 years ago

Help I need it now!! T14= 46, and t20= 100, find t3, t7, and tn

Vinil7 [7]

Answer:

$t_3 = -53\\\\\\t_7 = -17\\t_n= -80 +9n$

Step-by-step explanation:

Arithmetic sequence:

$\sf \boxed{t_n=a+(n-1)d}$

Here a is the first term and d is the common difference.

$t_{14}= 6$ ⇒ $\sf a + 13 d = 46$ ------------(I)

$\sf t_{20} = 100$ ⇒ a + 19d = 100 ---------(II)

Subtract equation (I) from (II)

(I1) a + 19d = 100

(II) a + 13d = 46

- - -

6d = 54

d = 54 ÷ 6

$\sf \boxed{d = 9}$

Substitute d = 9 in equation(I) and find 'a',

a + 13*9= 46

a + 117 = 46

a = 46 - 117

a = -71

$\sf t_3 = -71 + 2*9$

= -71 + 18

= -53

$\sf t_7 = -71 + 6*9$

= -71 + 54

= -17

$\sf t_n= -71 + (n-1)*9$

= -71 + 9*n - 1 *9

= -71 + 9n - 9

= -71 - 9 + 9n

= - 80 + 9n

5 0

1 year ago

Factor by Grouping 8x+8y+rx+ry I do not understand this.

nadezda [96]

FACTORISATION IS BASICALLY FINDING LIKE-TERMS.
1. FIND THE HCF OF 8. HERE, THE HCF IS 8. ALSO, CHECK ALL THE LIKE-TERMS. LIKE-TERMS ARE OUTSIDE THE BRACKET AND UNLIKE TERMS ARE INSIDE.
2. ADD THE TERMS IN THE BRACKET AND THE TERMS OUTSIDE THE BRACKET FROM STEP 1.

8x + 8y + rx + ry
1. 8 (x + y) + r (x + y)
2. (x +y) (8+r)

8 0

3 years ago

Read 2 more answers

Mikel is trying to save for college expenses. He has a job, but can only afford to put $20 per month aside. He has 4 years until

nadezda [96]

Answer:

960

20 times 12 moths to get 240 then multiply that by 4 years and get 960 .

Step-by-step explanation:

sorry if wrong ]

have a good day /night

may i pleae have a branlliest .

20 x 12=240 x 4 =960

4 0

3 years ago

Read 2 more answers