How many positive integers less than 10,000 are such that the product of their digits is 210?

210=1*2*3*5*7=1*6*5*7 (2*3 =6)

Those are the only sets of numbers that can be used (any other combination of factors will have two digit answers).

Numbers using 2,5,3,7 = 4! = 4 x 3 x 2 = 24
Numbers using 5,6,7,1 = 4! = 4 x 3 x 2 = 24
Numbers using 5,6,7 = 3! = 3 x 2 = 6

 24+24+6 = 54

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet