Factorize a² +3ab - 5ab - 15b².

Step-by-step explanation:

Work via factoring by groups:

!) re arrange the terms as follows:

then extract the common factor for the first two terms (a), and separately the common factors for the last two terms (3 b):

Now notice that the binomial factor (a-5 b) is in both expressions, so extract it:

which is the final factorization.

Step-by-step explanation:

the answer

b. they are parallel and will never intersect.

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500