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lorasvet [3.4K]
1 year ago
15

Calculate (3.012 x 10−8) + (4 x 10−8). 3.016 x 10−16 7.012 x 10−16 7.012 x 10−8 7.012 x 20−8

Mathematics
1 answer:
Kobotan [32]1 year ago
8 0

Answer: -3350.104 because you need to multiply the brackets first then subtract.

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A boat traveled 240 miles downstream and back. The trip downstream took 12 hours. The trip back took 24 hours. What is the speed
RoseWind [281]

Answer:

rate boat = 15 mph

rate current = 5 mph

explanation:

d = r * t

t = d/r

240 / (r_boat + current) = 12       Multiply both sides by r_boat + r_current.

240 = 12(r_boat + current)

240/ (r_boat - current) = 24       Multiply both sides by r_boat - r_current

240 = 24*(r_boat - current)    

Since the distances are the same in both equations, you can equate the right side of each.

12 (r_boat + current) = 24(r_boat - current)     Divide by 12

r_boat + current  = 2 (r_boat - current)             Remove the brackets.

r_boat  + current = 2*r_boat - 2* current          add 2 currents to both sides

r_boat  + 3currents = 2*r_boat                          Subtract r_boat both sides

3 currents = r_boat.

240 = 12*(r_boat + current.                               Divide by 12

20 = r_boat + current                                        Put 3 currents in for r_boat

20 = 3currents + 1 current                                Combine

20 = 4 currents                                                  Divide by 4

5 = current

The rate of the current = 5 miles / hour

3 currents = r_boat

3*5 = rate_boat

15 = rate of the boat

8 0
2 years ago
What is 63 over 75 as a decimal?
marissa [1.9K]

Answer:

0.84

Step-by-step explanation:

Use a calculator.  That would be 0.84.

                               3*21

Note that 63/75 = ---------- = 21/25.  Multiplying top and bottom by 4 results

                                3/25                   in 0.84 (so this answer checks out ok)

3 0
3 years ago
Write the sentence as an inequality. The cost of a ticket t will be no more than $52.
NeX [460]

Answer:

t is less than or equal to $52, or t <= $52

Step-by-step explanation:

If you can't have more than $52, then use less than symbol (<). The sentence doesn't state that a ticket shouldn't cost $52, so it's safe to assume that you can have exactly $52.

5 0
2 years ago
(Do not use spaces. Use to represent exponents. Example 2^3 is 22.)
Alik [6]

Answer: y=6^x-3

It is a exponent form of graph, so first:

y=a^x-b

When b=0, the asymptote is y=0 but as the asymptote given is y=-3, b=-3

Second:

the y value increases 6, when x changes 0 to 1, so a=6

8 0
2 years ago
Read 2 more answers
Which shows how to solve the equation -4/5 x = 80 for x in one step
san4es73 [151]

Answer:

-  \frac{1}{100}

Step-by-step explanation:

-  \frac{4}{5x}  = 80 \\  -  \frac{4}{80 }  = 5x \\ x =  -  \frac{1}{100}

8 0
1 year ago
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