How do I become better using mental math?

A box of cereal states that there are 93 calories in a three fourths -cup serving. What is the unit rate for calories per cup? How many calories are there in 3 cups of the cereal?

Solve for x (8 2/5 + 7 2/3) + 4 1/3 = x + 13 A. 6 2/5 B. 7 2/5 C. 8 2/5 D. 16 3/5

In a class of 20 students, 40% are boys. 25% of the boys and 50% of the girls wear glasses. How man students wear glasses?

a company has determined that its maximum profit occurs when it sells 10,000 units per month. for every 1,000 units more or less than 10,000 units that the company sells, its profit decreases by $5,000.

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Find the value of x when the area of a triangle is 22 in2 and has a base of 3x-1 and height of x.

Which relation is a function? A. (6, 5), (1, 1), (6, 4) B. (0, 1), (2, 3), (2, 5) C. (8, - 2), (-2, 5), (6, 0) D. (-2, 3), (-5, 9), (-5, 3)

Given tanx = 7/24. What is csc X

the population of the US was 282 million in the year 2000. and 309 million in the year 2010. assuming that the US population follows the model of uninhibited population growth, what will the population be in the year 2050?

X+5/5=x+9/7 x equals?