Which property is used in the statement?
if k over 2 = 5, then k=10
a: reflexive
b: symmetric
c: multiplication property of equality
d: subtraction property of equality

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.