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never [62]
3 years ago
12

A chemist begins with 120 mL of a radioactive substance that decays exponentially. After 24 hours, only 30 mL of the substance r

emain. How many mL will remain after 48 hours? 12.5 mL 7.5 mL 4.5 mL 9.5 mL
Mathematics
1 answer:
alisha [4.7K]3 years ago
6 0

Answer:

7.5 mL

Step-by-step explanation:

If it decays exponentially then you divide the previous number by 4 to get the next number and 30 divided by 4 is 7.5mL.

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Figure A is a scale image of figure B. Figure A maps to figure B with a scale factor of 2/3. What is the value of x?
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9514 1404 393

Answer:

  x = 7

Step-by-step explanation:

10.5 maps to x with a scale factor of 2/3:

  x = 10.5 × 2/3

  x = 7

6 0
3 years ago
Most insurance companies will replace a vehicle any time an estimated repair exceeds​ 80% of the​ "blue-book" value of the vehic
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3 years ago
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tatuchka [14]

Answer:

12/7

Step-by-step explanation:

1 x 7= 7, then add 5 because of the denominator. 12/7

8 0
3 years ago
Can someone help me on this question? I’ll give brainliest if you answer soon!!!
Sidana [21]

Answer:

∠ 5

Step-by-step explanation:

Given;

Which angle number represents ∠ WYU

picture

Solve;

First, we have to find the letters WYU in the picture.

Knowing that, WY is an edge, YU is an edge.

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So you get ∠ WYU. As shown in the figure in the picture, 5 represents

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7 0
2 years ago
A painter is paid 11 dollars per hour and can paint 8 m^2 with a roller in this time. renting a spray gun costs 5 dollars for ea
gavmur [86]
Painter cost when he use the roller.
40:8=5 hours for painting 40 m²
5+1/2 =5 1/2 where 1/2 is time needed for clean upthe roller
total cost is
(5 1/2)*11=55+11/2=60.5 dollars

Painter cost when he use spray gun
40:20=2 hours for painting 40 m²
2+1=3 time with the time needed for clean up the spray gun
total cost is
3*11+5*3=33+15=48 dollars

60.5-48=12.5 dollars

You save is 12 dollars 50 cents
6 0
3 years ago
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