If sin 20 degree=a and cos20 degree=b then which of the following represents the correct value of sin 70 degree in terms of a and/or b?

1) a+b

2) a

3) b

4) a-b

How do i write 15 decreased by twice a number in an algebraic expression?

Solve the equation 2x^2-5x+1=0

Quinine, which is found in the bark of the cinchona tree, is effective in A. reducing convulsions caused by the use of strychnine. B. reducing fever and other symptoms associated with malaria. C. reducing the burning sensations of St. Anthony's Fire.

due to evaporation the water level in wesleys aquarium dropped 2cm a week during the first three weeks in July what integer represents the change in water level during the three week period?

How many gallons do 8 quarts equal

What is The exact value of 5.3 million * 2.7 thousand

Dino works out for 1/2 hour every day if he does 6 different exercises each time he works out how long does Dino do each exercise

100 is 250% of what? i need to know fast

What is 2➗2 shoe work

Elle can buy 2 quarts of milk for $3 or 1 gallon of milk for $3 which is the better deal