Please solve for me simplify (45)-(+14)​

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints

3x + 4y = 5 x- 3y = -7 solve by substitution

When you flip a biased coin the probability of getting a tail is 0.6. how many times would you expect to get tails if you flip the coin 320 times?