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Zepler [3.9K]
3 years ago
13

Josephine is taking a college course, and her professor bases the course grade on the average of 2 tests taken in the semester.

She wants to know what she needs
to earn on the last test to maintain her grade. Rearrange the following equation for b, where is the average of 2 test scores, a and b.
C=a+b/2

1. b=2c/a
2. b=2c+a
3. b=2c-a
4. b=2c(a)
Mathematics
1 answer:
balu736 [363]3 years ago
4 0

Answer:

answer b is b=2c+a okay it is right answer

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If the lcm of two numbers a and b is 40 what is the lcm of 7 a^2 and 7b^2
nekit [7.7K]

Answer:

11,200

Step-by-step explanation:

Given that the lcm of a and b  is 40 then a and b are factors of 40. All the multiples of 40 as sets are 1 and 40, 2 and 20, 4 and 10, 5 and 8. Of all these, only 5 and 8 would give a lcm of 40.

Let a = 5 and b = 8 as such,

7 a^2 = 7 * 5^2 = 175

7b^2 = 7 * 8^2 = 448

Then the lcm of 7 a^2 and 7b^2

= 11,200

7 0
3 years ago
A company makes poppy lapel pins.
mezya [45]

Answer:

<h2>The required percentage is 65.45%.</h2>

Step-by-step explanation:

The total costing is 1000 \times 1.10 = 1100

35% were given to the charity, hence 350 were given to the charity.

There are (1000 - 350) = 650 lapel pins remaining.

60% of 650 = \frac{60}{100} \times 650 = 390 werre sold for 3.00 each. Hence, earning from here is 390 \times3 = 1170.

40% of 650 = 260 were sold at 5.00 for 2. It can also be said that \frac{260}{2} = 130 were sold at 5.00 each. Earning from this section is 130 \times5 = 650

Total earning is (1170 + 650) = 1820.

Profit percentage = \frac{1820 - 1100}{1100} \times100 = \frac{720}{11} = 65.45

5 0
3 years ago
A candle maker has 4 1/2 pounds of clear wax. He wants to cut the wax into pieces that are 2/3 pound each. How many 2/3 pound pi
prisoha [69]

Answer:

a)  10  pieces of  2/3 pound  can be made.

b) 0.54 pounds of wax is left over.

Step-by-step explanation:

Total amount of clear wax available =  4\frac{1}{2}  = \frac{9}{2} pounds

So, the maker has in total 4.5 pounds of wax

Now, The weight of each piece = \frac{2}{3}  = 0.66  pounds

To find the number of pieces that can be made out of 4.5 pounds of wax,

let that number = n

So, n = \frac{\textrm{Total weight of the clear wax}}{\textrm{Weight of each wax}}

or, n = n = \frac{4.5}{0.66}  = 6.81

So, nearly 6 pieces can be made completely out of the clear wax

Left over amount of wax  = Total weight -  Weights of the pieces made

                                            =  4.5- 6(0.66)

                                            = 0.54 pounds

Hence, 0.54 pounds of wax is left over

8 0
4 years ago
(5.2×10−2)×(8.0×10−4)= 
Digiron [165]
3800. go to math papa.

4 0
3 years ago
Read 2 more answers
Solve for the indicated variable: ⅖(z + 1) = y for z.
sweet [91]

Answer:

  z = 5/2y -1

Step-by-step explanation:

We observe that z has ...

  • 1 added
  • the sum multiplied by 2/5

To solve for z, we undo these operations in reverse order.

  \dfrac{2}{5}(z+1)=y\qquad\text{given}\\\\z+1=\dfrac{5}{2}y\qquad\text{multiply by 5/2}\\\\\boxed{z=\dfrac{5}{2}y-1}\qquad\text{subtract 1}

5 0
3 years ago
Read 2 more answers
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