The art teacher has 70 packages of beads with 18 beads in each package. She gives the students 40 of the packages to use. Explain how to find the number of beads the art teacher has left. Select the correct choice below. Fill in the answer box within your choice. A. Divide the number of beads in each package by the number of packages she has left. So, she has nothingm beads left. B. Multiply the number of packages she gave the students by the number of beads in each package. So, she has [] beads left. C. Divide the number of packages she started with by the number of beads in each package. So, she has [] beads left. D. Multiply the number of packages she has left by the number of beads in each package. So, she has [] beads left.

D. Multiply the number of packages she has left by the number of beads in each package. So, she has [] beads left.

Step-by-step explanation:

There were a total of 70 packages.

With 18 beads in each package.

And we are told that the teacher distributes 40 packages to students to use them.

To calculate how many spare packages are left we shall

-: Deduct the number of distributed packages from the total packages = (A)

And to calculate the number of beads left:

-: Multiply the value in (A) above with the number of beads in each package.

That is

70 - 40 = 30 = (A)

Now, number of beads = (A) 18 {number of beads in each package}

= 30 18 = 540 beads

The steps followed are similar to option D, thus, it is the correct option.

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step-by-step explanation:

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: