-3.9 ÷ 1.3 = -3
good luck :)
Hello,
sin S=19/54==>mes S=20.60...° A is false
cos P=19/54==>mes P=69.3993...° B is true
==> C is false
p =√(54²-19²)=50.5470...≈50.55 is true
Answer B AND D
Because the average is 7.7, his total points are equal to 7.7*10=77.
Because 7*10<77<8*10, Luke cannot have scored 8 10s. We now seek to prove that he can score 7 tens.
This leaves him with three tests left, that sum to 7 marks. There are clearly many ways to arrange this - for example, 2, 3, and 3 on the first three tests, then ten on all seven other tests. As this shows that 7 10s works and we have proven that 8 10s does not work, 7 is the maximum amount of 10s Luke could have scored.