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$If 2^n=128, then \left(2^{n-1}\right)\left(5^{n-2}\right)=?$

he expression of $\frac{1+\sqrt{2}}{1-\sqrt{2}}$ is equivalent to which of the following :

How many diagonals does a 63 - sided convex polygon have?

In a class 40% of the students enrolled for Math and 70% enrolled for Economics . If 15% of the students enrolled for both Math and Economics, what % of the students of the class did not enroll for either of the two subjects?

A man can hit a target once in 4 shots. If he fires 4 shots in succession , what is the probability that he will hit his target?

what is the maximum percentage discount that a merchant can offer on her Marked price so that she ends up selling at no profit or loss, if she had initially marked her goods up by 50% ?

A man borrowed Tk . 900 at 10% per annum simple interest and immediately lent the whole sum at 10% per annum compound interest. what does the gain at the end of 2 years?

The area of smallest square that can circumscribe a circle of area 616 cm2 is -----

A rectangular carpet has an area of 120 sq. meters and a perimeter of 46 meters. The length of its diagonal is--

A train 120 m long is traveling at a speed of 60 km / h. The time in which it will pass a passes by, walking at 6 km / h in the same direction is --

n + n = k +k and n + k = 5, then n=?

The average of a set of 12 numbers, which includes 35, is N. If 35 is removed from the set and 38 is added to the set, then what is the average of the new set of numbers in terms of N ?

Which of the flowing is a factor of the the expression $2x^3+1$

If simple interest on a certain sum of money is Tk. 256 and the rate of interest per annum equals the number of years,then the rate of interest is--

If A's income is 25% less than that of B, then how much percent is B's income more than that of A?

when the price of an article is reduced by 15% the sales increases by 35% . The percentage change in the total amount of receipts is-

If t is any integer, which of the following represents an odd number?

In theis diagram AB=AC angle A = 40 degree and BD is perpendicular to AC at D. how many degrees are there in angle DBC?

Johan walks 10 miles at an average rate of 2 miles per hour and returns on a bicycle at an average rate of 10 miles per hour. How long does the entire trip take him?

A man wishes to cover his floor with tiles, each one measuring 3/4 inch by 2 inches. If his room is rectangular, measuring 12 feet by 18 feet, how many such tiles will he need?