\( 82+97+53 \) (by rounding addends to the highest place value)

4) \( \frac{\csc ^{2} A-1}{\cot A \cdot \cos A}=\frac{1}{\operatorname{sen} A} \)

Ub. Prove a desigualdade \[ a^{2}+b^{2} \geq 2 a b, \quad \forall a, b \geq 0 . \] Utilize esta desigualdade para demonstrar que a média geométrica de dois números posi tivos nunca excede a sua média aritmética: se \( a>0 \) e \( b>0 \) então \[ \sqrt{a b} \leq \frac{a+b}{2} . \] 07.

11. \( 52-(-30) \)

traveltions, Part 2 - Instruction - Level G t(1)) The snail's rate is in \( \frac{3}{4} \) hour. Which animal is faster? per hour. (4)) Find the snail's speed in miles per hour. 1 mile (4)) The snail's speed is 1.2 mile(s) per hour

Tessa had \( \$ 90 \) in her checking account. She paid her cable/internet bill for \( \$ 75 \). She deposited \( \$ 50 \) from her part-time job before writing a check for \( \$ 80 \) to pay her credit card bill. What is Tessa's account balance? -15 dollars 295 dollars -115 dollars 145 dol ars