You know that 3+3+3+3=4*3=12.this shows that 4 groups of 3 equal 12. The expression x +x+x+x+=4x means x is used as an addend 4
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Step-by-step explanation:
15x+10x=12x+90; ⇔ 13x=90;
Answer:
The total number of U.S. high school students that played on a sports team that year can be estimated to be 7,950,000.
Step-by-step explanation:
From the random sample, we can expect that of all students played on a sports team that year. So in the bigger sample of 15900000 high school students, we can expect
students to have played on a sports team that year.