4. Simplify: -3(2x - 5)-2(4x+3) A.14x-9
B.-2x+21
C.-14x+9
D.-14x+ 21

Can someone help me ?

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.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.