book Maths Puzzle Numerical Ability

find the sum of the first 20 positive multiples of 3? this is algebera 3

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PLEAS I NEED HELP

1.IF ONE OF THE ANGLES IN A RIGHT TRIANGLE MEASURES 45 DEGREES, WHAT ARE THE MEASURES OF THE OTHER TWO ANGLES?

2.FIND THE PERIMETER OF A TRIANGLE WITH SIDES OF 4M, 2.3 M AN 3.7 M

PLEASE HELP
log7 + log (n - 2) = log 6n

log516 - log52t = log52

log5m = log5125

logy = log16 + log49

log6(b2 + 2) + log62 = 2


logy = log16 + log49