A ladder is leaning against a house. The top of the ladder touches the wall 10 feet from the bottom of the wall. The base of the ladder is 3 feet from the bottom of the wall. How long is the ladder? PLEASE ANSWER IT THE FIRST ONE WILL BE THE BRAINLIEST

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

Plz hurry evaluate the expression a+b where a=8 and b=19