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Dmitrij [34]
3 years ago
13

Which expresion is equivalent to 30(1/2x-2)+40(3/4y-4)

Mathematics
1 answer:
Dafna11 [192]3 years ago
6 0

Answer:

15x +30y -220

steps:

30(1/2x-2)+40(3/4y-4)

= 15x-60 +30y-160

= 15x +30y -220

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Lucy’s parents built a swimming pool in the backyard. Use 3.14 for π.
Neporo4naja [7]

Answer:

Distance around the pool = 162.8 feet

Area of the pool = 957 square feet

Step-by-step explanation:

Distance around the swimming pool = Perimeter of the pool

Perimeter of the pool which is a composite figure will be,

= Circumference of the semicircle + Sum of three sides of the pool

= πr + 2×(length of the pool) + width of the pool

= 3.14×(10) + 2×40 + 20

= 62.8 + 80 + 20

= 162.8 ft

Area of the pool = Area of the semicircle + Area of the rectangular pool

                           = \frac{1}{2}(\pi)(r)^{2}+(\text{length}\times \text{Width})

                           = \frac{1}{2}(3.14)(10)^2+(40\times 20)

                           = 157 + 800

                           = 957 square feet

8 0
3 years ago
Find all the numbers such that the number added to itself is less than the number subtracted from 6
gizmo_the_mogwai [7]

Answer:

All numbers less than 2 or (-\infty, 1] or (-\infty, 2)

Step-by-step explanation:

Given that:

Number is added to itself is less than the number subtracted from 6.

To find:

All such numbers.

Solution:

Let the number be x.

Here, an inequality will be made.

When solved, it might give more than one answers.

As per the question statement, let us write the inequality.

Number added to itself \Rightarrow x +x =2x

Number subtracted from six = 6-x

As per question:

2x

So, the answer is:

All numbers less than 2 or (-\infty, 1] or (-\infty, 2).

4 0
3 years ago
What is 1/3 plus 1/2 in fraction form
Citrus2011 [14]

Answer:

5/6

Step-by-step explanation:

Hope this helped!!!

7 0
2 years ago
2/5gal fill up 3/4 of a tank how many gallons will it take
Olin [163]

Answer:

8/15 gallons or 0.5333 gallons

Step-by-step explanation:

x = total

0.4 = 0.75x

0.4/0.75 = x

0.533 = x

0.533 = 8/15

5 0
2 years ago
What is the median of 3,4,5,5,7,8
Scilla [17]
The median of the set of numbers is 5.
4 0
2 years ago
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