what is unknown minus 3 times unknown =minus 21

Digits 1 to 9 stand in a row in a descending order. Insert the symbols of pluses and minuses between them to get 100. Use only 4 signs. => 98 + 76 - 54 - 3 - 21 = 100 or 98 - 76 + 54 - 3 + 21 = 100 or 98 - 76 + 54 + 3 + 21 = 100 ..

Zelma had $20 in her pocket. The money left with her after buying books is equal to $20 minus $3.40 times the number of books she bought. Choose the function that represents a relation between the number of books she bought and the money left with her. => f ( n ) = 20 ..

Find the length of the unknown side, correct to 1 decimal place where necessary. => 3.9 or 3.6 or 3.8 or 4..

Find the length of the unknown side, correct to 1 decimal place if necessary. => 3.8 or 4.6 or 5.7 or 6.9..

A survey taken reported that 9 19 th of the population listened to the President's speech. If the margin for error is plus or minus 4 38 , then what are the maximum and minimum values for the actual number of people who listened the speech? => 3 5 and 5 13 or 23 39 and..

B shows that one mole of A produces one mole of B and thus the rate at which the concentration of A decreases will be the same as the rate at which the concentration of B increases. The decrease or increase in the concentration of the reactants or products may also be expressed in terms of change i..

>As the distance is unknown, let x be the distance in kilometres and is the time in hours taken by the 1 s t walker to cover the distance x. is the time in hours taken by the 2 n d walker to cover the same distance x. According to the terms of the problem, 4x - 3h..

Simple Pendulum Time Period of Oscillation Varies with Time - Let us now find out how Time Period of oscillation vary with time. Set up a simple pendulum and measure the time taken for 10 oscillations of the simple pendulum for different lengths lik..

Let us now find out how Time Period of oscillation vary with time. Set up a simple pendulum and measure the time taken for 10 oscillations of the simple pendulum for different lengths like 10,20,40,60,80 and 100 cm. Time period of a pendulum varies with th..

The measurements in an experiment to approximate an unknown continuous function y = f ( x ) are shown in table. Approximate the integral ∫ 0 1 f ( x ) dx using the Trapezoidal Rule. x 0 0.25 0.5 0.75 1 f ( x ) 1 1.5 2 2.5 3 => 3.5 or 3 or 4 or 2 or 2.5..