The Hoffman family has bought one pizza on Friday night every week for the last 10 years. How many pizzas have they bought on Friday nights? Enter your answer in the box.

520 pizzas

Step-by-step explanation:

1 year = 52 weeks

Meaning the number of Fridays in a week = 52 Fridays

We are told that: The Hoffman family has bought one pizza on Friday night every week for the last 10 years.

Hence, the number of pizzas they bought in 1 year

= 52 Friday × 1 pizza

= 52 pizzas

For the last 10 years

= 52 pizzas × 10

= 520 pizzas

Hence, they have bought 520 pizzas in the last 10 years

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

step-by-step explanation: