Mikaela wants to use her savings to buy a surfboard that costs $329. She has a coupon for 25% off and the sales tax is 7.5%. She
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supplementary angles add up to 180°.
x = measure of such angle
x + 20 = measure of her sibling.
since "x" has 20 less than her sibling, then clearly her sibling has to have 20 more than "x".