few_shots: Example:
Problem/activity:
Find the general solution for:
$${\mathrm{cos}\left({\pi\over2}+x\right)=\mathrm{tan}{\pi\over4}}$$


Standard options: 
A. Prove the Pythagorean identity sin^(2)(θ) + cos^(2)(θ) = 1 and use it to find sin(θ), cos(θ),or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.
B. Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.


Your response, in json format:
{
  "explanation": "An initial step when solving for x in this problem requires the use of the addition formula for cosine on the left side of the equation. Solving this problem does not require use of the Pythagorean identity.",
  "answer": "B"
}

Now, assign the following problem or activity to one or more relevant standards it aligns with.
shot_info: fl_problem_001894

HS
options: Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Use place value understanding to round whole numbers to the nearest 10 or 100.
problem_activity: Problem 1
a.   What do you notice? What do you wonder?
[IMG]
b.   Determine the value of the point on each number line in Part (a) above.
Problem 2
a.   Label each point with the value it represents.
[IMG]
[IMG]
[IMG]
b.   Locate and label each number on the number line. Label the intervals with the numbers they represent if it helps.
60
[IMG]
897
[IMG]
364
[IMG]
Problem 3
a.   Plot 55 on a number line from 50 to 60.
b.   Plot 55 on a number line from 0 to 100.
c.   Plot 55 on a number line from 0 to 1,000.


correct_option_index: 2