Solve for 0.
Sin 75° = cos 0

Cosine means complementary sine, the sine of an angle and the cosine of the  complementary angle are the same.

sin 75° = cos θ

cos (90° - 75°) = cos θ

cos 15° = cos θ

In general when we have

cos x = cos a

the solution is

x = ±a + 360°k, integer k

Here they just went with x=a, or

θ = 15°

C      θ = 15°

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3

13

step-by-step explanation:

divide the cost of the total of sodas you bought by the cost of one soda, for example:

$24.57 divided by $1.89 is 13 which means you bought 13 sodas