Multiple Choice Question: All factors being equal, which of the following concrete mixes has the highest 28-day compressive strength?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

The following three terms are in geometric progression: x, 2x + 7, 10x – 7. What is the 6th term?
In a gambling game a man is paid \$50 if he gets all heads or all tails when 3 coins are tossed, and he pays out \$30 if either 1 or 2 heads show. What is his expected gain?
Solve for x if $5^{x^2} = 625$.
Selena invested a certain amount of money at a rate of 12% compounded bi-monthly. How do we calculate the effective rate of Selena's investment?
After 4/5 of his mangoes spoiled, Albert bought enough from Bryan so that each then had 1/3 as many as first and Albert had 80 more than Bryan. How many had Albert at first?
xO3wmaY-1 What is the amount of the deposit after five years?
Find the area of a sector of a circle of radius 6 cm and a central angle of 60°.
The probability that a patient recovers from a rare blood disease is 0.4. If 15 people are known to have contracted this disease, what is the probability that at least 10 survive?
xO3wmaY-3 If the monthly deposit after two years is increased to P1,000, and if the interest rate is 18% compounded monthly, what is the amount of the deposit after five years?
Compute the sum of the integers from 1 to 1000.
The total surface area of a closed cylindrical tank is 153.94 square meter. If the volume is to be maximum, what is its height in meters.
Find the product of the roots of the quadratic equation $4x^2 + 2x - 1 = 0$.
A spider eats three flies a day. Until he fills his quota, he has an even chance of catching any fly that attempts to pass.
The shipment of items is divided into two portions. If the difference between the portions is one-third of their average, what is the ratio of the larger portion to the smaller portion?
Find the first derivative of y with respect to x of the following function, when x = 2.$$ y = \dfrac{\ln x^2}{\sin 2x} $$