russboys3

19.03.2020 • 

Mathematics

A student evaluated an expression as shown. Which statement about the student's work makes the most sense?

A. The work is not correct because the result of 2.92.9 should be 0.

B. The work is not correct because multiplication should have been evaluated before subtraction.

C. The work is not correct because 5.6−2.7 does not equal 2.9.

D. The work is correct.

PLEASE HELP XD

Ответ:

Terrydactly

02.06.2020

Mathematics

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30 km/h

Step-by-step explanation:

usual speed= x km/h

increased speed= x +10 km/h

distance= 360 km

time difference= 3 h

360/x= 360/(x+10) +3360/x= (360+ 3x+30)/(x+10)360(x+10)= x(390+3x)360x+3600= 390x+ 3x²3x² + 30 x -3600=0 x²+10x-1200=0x=30 km/h

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