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3 years ago

Can you plz help me I don’t understand at all

Mathematics

1 answer:

slamgirl [31]3 years ago

8 0

David made 30 cups of tea per hour. David worked for D hours. In D hours, he made 30D cups of tea. Then he made an additional 10 cups of tea, so this week, he made 30D + 10 cups of tea.

Andrew made 35 cups of coffee per hour. Andrew worked for A hours. In A hours, he made 35A cups of tea.

The total cups of tea and coffee made this week is:

30D + 10 + 35A

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Jack and Jill live 126 km apart. They want to leave their homes at the same time,

Digiron [165]

Answer:

Both will leave their homes to meet on time at 9 am

Step-by-step explanation:

Given as, Distance between Jack and Jill = 126 km

Speed of Jack rides = 18 kilometers per hours

Speed of Jill rides = 24 kilometers per hours

Let the distance travel by Jack = x km

And the distance travel by Jill = (126 - x ) km

Time taken by Jack and Jill = T hours

Now , Distance = Speed × Time

So, x = 18 × T

And 126 - x = 24 × T

Or, 126 - x = 24 × $\frac{x}{18}$

Or, 126 - x = x × $\frac{4}{3}$

Or, 378 - 3x = 4x

Or, 378 = 7x

i.e x = $\frac{378}{7}$ = 54 km

And distance travel by Jill = 126 - 54 = 72 km

So, time taken by Jack = $\frac{x}{18}$ = $\frac{54}{18}$

Or, Time taken by Jack = 3 hours

Similarly Time take by Jill = $\frac{72}{24}$ = 3 hours

∵ Both Jack and Jill will take 3 hours to meet at 12 : 00 pm

Hence, Both will leave their homes to meet on time at 9 am Answer

7 0

3 years ago

Use the distributive property to simplify 27-9x+15y

faust18 [17]

27-9x+15y=3(9-3x+5y)

6 0

3 years ago

Find the area of the shaded

mestny [16]

Answer:

40.5 m²

Step-by-step explanation:

Area of the shaded = area of the square - area of the triangle

Area of square = s²

s = 9 m

Area of square = 9² = 81 m²

Area of triangle = ½*b*h

b = 9 m

h = 9 m

Area of triangle = ½*9*9 = 40.5 m²

Area of the shaded = 81 - 40.5 = 40.5 m²

7 0

2 years ago

If x^2 = a and a > 0. what is x?

7nadin3 [17]

$\\ \sf\longmapsto x^2=a$

$\\ \sf\longmapsto x=\sqrt{a}$

Now if a be 1,2,3,4....

$\\ \sf\longmapsto x=\sqrt{1}=1$

$\\ \sf\longmapsto x=\sqrt{2}$

$\\ \sf\longmapsto x=\sqrt{3}$

$\\ \sf\longmapsto x=\sqrt{4}=2$

And so on

6 0

2 years ago

Help ASAP!!!!!!!!!!!!

zepelin [54]

Answer:

x is greater than or equal to -4

Step-by-step explanation:

I am not sure if I have to graph as well so I will just solve the inequality.

3x-12 greater than or equal to 7x+4

+12 +12

3x is greater than or equal to 7x+16

-7x -7x

-4x is greater than or equal to 16

-4x/-4 16/-4

x is greater than or equal to -4

7 0

3 years ago