The astronomy club wants to buy five different eyepieces for a new telescope. the 6-, 12-, and 20-millimeter lenses cost $42.95 each, and the 32- and 40-millimeter lenses cost $57.96 each. estimate the total cost of the lenses to the nearest whole dollar.

$317.66

Step-by-step explanation:

The Total cost of the lenses will be 3 times $42.95 and 2 times $57.96

That is

Cost = 3*42.95+2*57.96

        =128.85 +115.92

        = 244.77

hence cost of all the lenses will be $244.77

the ratio of white tiles to blue tiles is 48: 16. the ratio in it's simplest form is 3: 1.

step-by-step explanation:

ratio: take the first number and add a colon next to it, then add the second number after that. make sure the ratio order matches up with the written problem!

simplest form: we can simplify the ratio 48 : 16 by dividing both terms by the greatest common factor (gcf).

the gcf of 48 and 16 is 16.

divide both terms by 16:

48 ÷ 16 = 3

16 ÷ 16 = 1

reducing to simplest form:

48 : 16 = 3 : 1

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step-by-step explanation: