You work as a lab assistant. Each morning you are responsible for grouping the correct number of test tubes for each experiment that will be conducted that day. Today 40 test tubes will be used for 12 experiments. The first two experiments will require 4 test tubes each. Six of the experiments will require 3 test tubes each, and 2 of the experiments will require 2 test tubes each. Each of the two remaining experiments will use exactly the same number of test tubes.


Which calculation is appropriate to perform first when determining the number of test tubes that will be used for each of the two remaining experiments?

A) 10/2

B) 40 − 30

C) 40 − 12

D) 2(4) + 6(3) + 2(2)

Answer:  D

Step-by-step explanation:

In total 40 test tubes are required for 12 experiments.

The first two experiments will require 4 test tubes for each.

Hence, there will be a requirement of  = 8 test tubes.

Six experiments require 3 test tubes each.

Hence, these 6 experiments will take  18 test tubes.

Other 2 experiments will take 2 test tubes.

Here,  = 4 test tubes will be required.

Till now a total of (8 + 18 + 4) = 30 test tubes have been used.

The remaining number of test tubes is (40 - 30) = 10.

The remaining experiments require  test tubes.

The first calculation to perform is 2(4) + 6(3) - 2(2).

can someone help me with this questions please?

The table shows how the cost of a tractor repair depends on the time needed for the repair.

Repair time Cost
(hours ) (dollars)
ーーーーーーーーーー
2 I 180

5 I 450

? I 630

10 I 900

20 I 1,800


Which expression can be used to find the number that is missing from the third row of the table?


A. 450➗5

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a. Write the question or problem statement for the situation.

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The temperature on Monday was -7 °C. By Tuesday the temperature rose to -4 °C. Find the change in temperature.

11
3
4
7

HELP!
Which of the following functions represents the values in the table below?

x     0         2         4         6    
f(x)     2         10         66         218    

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In a direct variation, y = 14 when x = 2. Write a direct variation equation that shows the relationship between x and y.

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Please answer all questions, will also give brainiest.

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C. 2
D. 1

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Question 3 options:

The satellite's speed was 90 kilometers per minute.


The satellite's speed was 10 kilometers per minute.


The satellite's speed was 190 kilometers per minute.


The satellite's speed was 200 kilometers per minute.

Solve [tex]a^{3}[/tex] = 11

Solve [tex]c^{2}[/tex] = 27

If a human weighs 115 pounds on Venus, how much would that same human weigh on Mercury?

Which statement is true about figures ABCD and A'B'C'D'?

A sewing club used 48 feet of fabric to make 8 blankets. At this rate, how many blankets can be made from 36 feet of fabric?

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Help please... dont answer if u dont know bc this is for a grade

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Please help use your explanation too!

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i dont have brain cells :/

Sorry for the image quality, but could someone help me with this?

URGENT!!! PLEASE ANSWER!!!!!

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. His sister states that the expression should be x + x + 0.5x + y + y – 2. Who is correct? Explain.

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CAN SOMEONE EXPLAIN HOW I DO THESE PROBLEMS? IM SO CONFUSED AND I HAVE A LOT TO DO PLEASE !!!!!!!

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4. Jim is standing beside a pool. He drips a weight from 4 feet above the surface of the water in the pool. The weight travels a total distance of 12 feet down before landing on the bottom of the pool. Explain how you can write a sum of integers to find the depth of water.