Students in a science class investigated how the speed of sound changes with the air temperature outside. The data are shown in the scatterplot.
Time Elapsed
Attempt due: ALl
10 Minutes,
Science Investigation

Y
355
350
345
Speed of Sound (m/s)
340

335.
330
0
10 20 30 40
Air Temperature (°C)
Based on the scatterplot, what is the best prediction of the speed of sound when the air
temperature is 50°C?
F 350 m/s
G355 m/s
H 360 m/s
J 365 m/s

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

(50 ) mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.