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3 years ago

I need help with (b) plz help me

Mathematics

1 answer:

Alex73 [517]3 years ago

5 0

He would need to work at least five hours

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If u can answer these please do

enot [183]

Answer:

1) 8.5x10^8

2) 5.3x10^-3

3) 9.95x10^12

Step-by-step explanation:

Since they have the same exponents, you just add or subtract and leave the rest the same.

1) 8.5x10^8

2) 5.3x10^-3

3) 9.95x10^12

8 0

3 years ago

Read 2 more answers

Explain your answer !! Have a nice day Will give braisnlt

lora16 [44]

Answer:

The equations are:

$4H + 3P = 13.75$

$2H + 5P = 11.25$

$Hotdog = 2.50$

$Pretzel = 1.25$

Step-by-step explanation:

Let:

$H = hot\ dog$

$P =Pretzel$

For Tina:

$4H + 3P = 13.75$

For Doug:

$2H + 5P = 11.25$

Solving for the price of both items:

We have:

$4H + 3P = 13.75$ --- (1)

$2H + 5P = 11.25$ --- (2)

Multiply (2) by 2

2 * ( $2H + 5P = 11.25$ )

-------------------

$4H + 10P = 22.50$ --- (3)

Subtract (3) from (1)

$4H + 3P = 13.75$

$4H + 10P = 22.50$

----------------------

$4H - 4H + 3P - 10P = 13.75 - 22.50$

$3P - 10P = 13.75 - 22.50$

$-7P = -8.75$

Solve for P

$P = \frac{-8.75}{-7}$

$P = 1.25$

Substitute 1.25 for P in (2)

$2H + 5P = 11.25$

$2H + 5 * 1.25 = 11.25$

$2H + 6.25 = 11.25$

Collect Like Terms

$2H = 11.25-6.25$

$2H = 5$

Solve for H

$H = \frac{5}{2}$

$H = 2.50$

3 0

3 years ago

T=pd/2x solve for X i always get confused when theirs more then one letter

Ainat [17]

When there's more than one letter, and you just have to solve for one variable, you can just solve it like you would any other equation. Treat the other variables like numbers and add, subtract, multiply, and divide them to both sides of the equation in order to isolate the variable you want to solve for.

$t= \frac{pd}{2x} \\ \\ t*2x= \frac{pd}{2x}*2x \\ \\ 2tx=pd \\ \\ \frac{2tx}{2t} = \frac{pd}{2t} \\ \\ x=\frac{pd}{2t}$

7 0

3 years ago

Read 2 more answers

Thirteen less than the sum of a number and 7 is -30. Find the number

Verizon [17]

Answer:

do the opposite of the equation so adding is subtracting and multiplying is dividing

-30-7=-37

-37+13=-24

-24 is the answer

-24+7=-17-13=-30

Hope this helps

Step-by-step explanation:

3 0

3 years ago

Hilary and Devin will collect data to find out where the seventh grade students should take their fie group should Hilary and De

nikklg [1K]

The answer is b, hope this helps

8 0

3 years ago