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3 years ago

Dr. Smith's office is open 8 hours a day. The doctor allows 25 minutes for office

Mathematics

1 answer:

Viefleur [7K]3 years ago

6 0

Answer:

Step-by-step explanation:

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Solve for x. Explain the steps taken to find the solution. 3/2 + 3x/5 = 9/2 4x/5

Iteru [2.4K]

Answer:

i just got it right

7 0

3 years ago

Can someone plz help me solved this problem I need help plz help me! Will mark you as brainiest!

I am Lyosha [343]

Answer:

13 l of 15%, 13 l of 25%, 26 l of 70%

Step-by-step explanation:

solutions:

15%, 25% and 70%

final solution:

52 l of 45%

This includes 0.45*52l= 23.4 l acid

Let's assume:

amount of 15% solution= x
amount of 25% solution= y
amount of 70% solution= z
and we have z=2y

so there are 2 equation:

x+y+z=52

0.15x+0.25y+0.7z=23.4

x+y+2y= 52 ⇒ x+3y= 52 ⇒ x= 52- 3y

0.15x+0.25y+1.4y=23.4

0.15x+1.65y=23.4
0.15*(52-3y)+1.65y=23.4
7.8-0.45y+1.65y=23.4
1.2y=23.4-7.8
1.2y= 15.6

y=15.6/1.2
y= 13 l

--------

x= 52- 3*13= 13 l
z= 2y= 2*13= 26 l

6 0

4 years ago

Last year Eileen spent $45 on her brother's birthday present. This year she spent $25 more than that. How much did she spend on

luda_lava [24]

Answer:

She spent 70 dollars on his birthday present.

Step-by-step explanation:

Its just 45 plus 25.

3 0

3 years ago

!!!!! HELP ME OUT PLS!!!

podryga [215]

Answer:

EF is 11

Step-by-step explanation:

3x-4=x+6

2x=10

X=5

5+6=11

5 0

2 years ago

Read 2 more answers

the length of the side of two squares are 4cm and 6cm .Find in its simplest form the ratio of them perimeter and area

Zolol [24]

Length of side of a square = 4cm

Perimeter of this square :

$= \tt4 \times side$

$= \tt 4 \times 4$

$= \tt16 \: cm$

Thus, the perimeter of this square = 16 cm

Length of side of the second square = 6 cm

Perimeter of this square :

$= \tt 4 \times side$

$= \tt4 \times 6$

$= \tt 24 \: cm$

Thus, the perimeter of this square = 24 cm

Ratio of the perimeters of both the squares :

$= \tt16 : 24$

$= \tt \frac{16}{24}$

$= \tt \frac{16 \div 4}{24 \div 4}$

$= \tt \frac{4}{6}$

$= \tt \frac{4 \div 2}{6 \div 2}$

$= \tt \frac{2}{3}$

Thus, the ratio of the perimeter of both the squares = 2:3

Length of side of the first square = 4 cm

Area of this square :

$= \tt side \times side$

$= \tt 4 \times 4$

$= \tt {16cm}^{2}$

Thus, the area of the first square = 16 cm²

Length of side of the second sqaure = 6 cm

Area of this square :

$= \tt \: side \times side$

$= \tt 6 \times 6$

$= \tt{36cm}^{2}$

Thus, the area of the second square = 36 cm²

Ratio of the areas of the two squares :

$= \tt16 : 36$

$= \tt \frac{16 \div 4}{36 \div 4}$

$= \tt \frac{4}{9}$

$= \tt4 : 9$

Thus, the ratio of the areas of the two squares = 4:9

Therefore, the ratio of the perimeter of the squares = 2:3 and the ratio of the areas of these squares = 4:9.

4 0

3 years ago